Triple Room
- 1 King-size bed
- Heating
- Air conditioning
Hotel · Barcelona · Catalonia
Hotel Sb Diagonal Zero 4 Sup
A modern 4-star hotel in Barcelona’s tech district, close to the sea and metro, with a standout breakfast and a full spa floor.
- Highly rated breakfast buffet
- Spa with sauna, Turkish bath, and hot tub
- Sea-view rooms and metro access
8.4
Great
9564 reviews
Booking.com 8.4 · 9564 reviews
About
Hotel Sb Diagonal Zero 4 Sup
Hotel Sb Diagonal Zero 4 Sup sits in Barcelona’s Forum area, a short walk from the sea and the El Maresme | Fòrum metro stop. The 262-room property is part of the Diagonal Zero skyscraper complex, with contemporary rooms and a design that favours clean lines and floor-to-ceiling windows.
Guests come for the substantial breakfast — frequently called the best of any stay — and the wellness floor with a seasonal pool, sauna, Turkish bath, and hot tub. The hotel also has a fitness centre, a business corner, and an on-site restaurant and bar, making it a practical base for both leisure and work.
- Non-smoking rooms
- Wi-Fi
- Parking
- Safe deposit box
- 24-hour reception
- Express check-in/ -out
In brief
What works, what to weigh
+
Strengths
4 reasons to book- Breakfast that gets called out by name — Multiple reviews single out the breakfast as the highlight — one guest called it the best of any hotel stay, with a large salad and fruit bar, hot dishes, and a children's buffet. The buffet also runs for generous hours, so you're not rushing.
- A proper spa and wellness floor — The hotel has a seasonal outdoor pool, sauna, Turkish bath, jacuzzi, and massage services. Several guests mention the spa as a welcome way to unwind after a day of sightseeing.
- Rooms with views and modern comfort — Guests repeatedly mention well-appointed, beautifully maintained rooms, several with sea views and some with bathtubs or hot tubs. The superior sea-view rooms are a clear favourite.
- Practical location near the sea and metro — The hotel sits close to the El Maresme | Fòrum metro stop and the waterfront, giving easy access to central Barcelona. Guests note the convenience for exploring the city.
–
Worth weighing
4 to weigh- Rooms score lower than dining — While breakfast earns a 9, the rooms and cleanliness category sits at 7 — the lowest of the four. A few guests found the rooms well-appointed but not exceptional for the price point.
- Price and service rated 7 — Value for money and service scores are lower than the dining and location ratings. Some travellers may find the nightly rate — from £325 — steep for the room category on offer.
- No pets and limited check-in window — Pets are not allowed, and check-in is strictly between 15:00 and 23:59. If you arrive late or early, you'll need to plan around those hours.
- Area average is higher — The hotel's 8.4 rating sits below the Barcelona area average of 8.8 across 3,638 properties — a sign that some nearby alternatives may offer a more consistent experience.
01 — Rooms
Rooms & rates
High season: summer dates usually book out a few weeks ahead.
Suite Spa Bath
- 1 King-size bed
- Heating
- Air conditioning
Double Room Spa Access
- 1 King-size bed
- Heating
- Air conditioning
Double Room
- 1 King-size bed
- Heating
- Air conditioning
Superior Double or Twin Room Sea View
- 1 King-size bed
- Heating
- Air conditioning
Double Room
- 2 Single beds
- Heating
- Air conditioning
Superior Double or Twin Room Sea View
- 1 King-size bed
- Heating
- Air conditioning
Superior Double Room Sea View Spa access
- 1 King-size bed
- Heating
- Air conditioning
Deluxe Suite Spa Bath
- 1 King-size bed and 1 Sofa bed
- Heating
- Air conditioning
Suite Hot Tub
- 1 King-size bed
- Heating
- Air conditioning
Double or Twin Room
- 1 King-size bed
- Heating
- Air conditioning
02 — Amenities
Services & amenities
Everything included at this stay — the facilities and essentials, at a glance.
Wellness & Relaxation
- Seasonal outdoor pool
- Spa & wellness centre
- Solarium
- Sauna
- Turkish bath
- Jacuzzi
- Massage
- Pool with view
- Sun loungers
- Sun terrace
Food & Drink
- Restaurant
- Snack bar
- Bar/ Lounge area
- In-room breakfast
- Packed lunches
- Special diet menus
- Children's buffet
- Coffee shop
Services & Extras
- 24-hour reception
- Express check-in/ -out
- Room service
- Housekeeping
- Laundry
- Dry cleaning
- Car hire
- Tours/ Ticket assistance
- Shoe shine service
- Welcome drink
- Business centre
- Meeting/ Banquet facilities
In-Room Amenities
- Air conditioning
- Heating
- Mini-bar
- Soundproofed rooms
- Sitting area
- Terrace
- Garden furniture
- Tea and coffee facilities
- Electric kettle
- Ironing facilities
- Free toiletries
- Flat-screen TV
- In-room computer
- AM/FM alarm clock
- Safe deposit box
Family & Accessibility
- Rooms/ Facilities for disabled
- Cots
- Baby pushchair
- Children's buffet
- Non-smoking rooms
- Allergy-free rooms
- Lift
- Key card access
Photos
Gallery
03 — Reviews
What guests say
Recent verified reviews from guests who stayed here.
Guest-rated 8.4/10 from 9,564 reviews
Booking.com · 8.4 · 9564 reviews
8.4Verified guest“Thanks, you're great! A well-managed and nicely furnished place. Rooms are beautifully decorated, with a bathtub, and everything is in good order. Supplies are plentiful: iron and board, key card, coffee and tea maker.”
8.4Verified guest“The hotel is fantastic, especially the views and the convenient location — we took the metro into the centre. Our well-equipped room had central heating, a safe, and pay-per-view TV.”
8.4Verified guest“We had a deluxe room with a hot tub, and we loved it.”
8.4Verified guest“We really enjoyed our room — cleaned daily with fresh towels — and it came with a great view and a clear note explaining the details.”
8.4Verified guest“The modern decor was elegant. Accessibility features made navigating the public spaces easy, so I could enjoy all the amenities without any trouble.”
8.4Verified guest“The staff are very friendly and speak several languages!”
04 — Location
Getting around Barcelona
The property sits in Barcelona.
Getting around: The El Maresme | Fòrum metro stop is close by, putting you within reach of central Barcelona in a few stops. The hotel also sits near the seafront, so you can walk along the promenade when the weather cooperates.
Local food: Breakfast is the headline here, but the on-site restaurant and bar cover lunch and dinner. For outside options, you're in the Forum area — a short metro hop to the tapas bars of El Born or the waterfront restaurants of Barceloneta.
Placa De Llevant, S/N, Barcelona, Catalonia, 08019, Spain
05 — Good to know
Policies & conditions
Hotel details are shown for reference. Final rate terms are confirmed on the partner’s site at booking.
- Check-in
- From 15:00-23:59
- Check-out
- By 04:00-12:00
- Cancellation
- Free cancellation on many rates — terms on booking page
- Payment
- Pay-at-hotel available on many rates; final terms at booking
- Pets
- Not allowed
- Property
- 838 rooms
06 — Questions
Frequently asked
What are the check-in and check-out times?
Check-in is from 15:00 until 23:59, and check-out is from 04:00 to 12:00. A late checkout until noon is available, which several guests appreciated.
Does the hotel have parking?
Yes, the hotel offers parking, and there's also an electric vehicle charging station on site.
Are pets allowed at the hotel?
No, pets are not allowed at Hotel Sb Diagonal Zero 4 Sup.
Is there a spa and pool?
Yes, the hotel has a seasonal outdoor pool, a spa and wellness centre, a sauna, a Turkish bath, a jacuzzi, and massage services. There's also a fitness centre.
What is the breakfast like?
Guests consistently rate the breakfast highly — it includes a large salad and fruit bar, a wide selection of hot dishes, and a children's buffet. Breakfast hours are generous.
Is the hotel accessible for guests with disabilities?
Yes, the hotel has rooms and facilities for disabled guests, and one review praised the accessibility features in the public spaces.
The bottom line
A dependable, well-run hotel with a genuinely memorable breakfast and a serious spa floor. If those matter more to you than a slightly higher nightly rate, it's a solid pick for a Barcelona stay.
8.4Best for: breakfast lovers, spa seekers, and travellers who want metro access to the centre.
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