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AC Hotel Diagonal L´Illa — Barcelona
Marriott Bonvoy · AC HotelsUpdated reviewed 2026-06-30 · cash rates + editorialBarcelona, Spain

AC Hotel Diagonal L´Illa Barcelona

AC Hotel Diagonal L’Illa is a four-star, 103-room Marriott Bonvoy property on Avinguda Diagonal 555 in Barcelona’s Tres Torres / Les Corts business-and-shopping district, directly beside the L’Illa Diagonal mall.

103-room modern boutique design with exposed brick, iron and glass facadeAC Lounge offering European breakfast, Mediterranean dishes and evening cocktailsComplimentary Wi-Fi, fitness centre and on-site laundryDirect adjacency to L’Illa Diagonal mall and nearby restaurants and shopsMobile Key and free Wi-Fi for Marriott Bonvoy members
See the verdict When to go
Booking this stay

Bookable with Marriott Bonvoy points. Award pricing varies by date and category, so we link straight to the official Marriott Bonvoy award chart for current rates rather than publishing a number that can go stale. Cash rates below are our own observed rack rates, not what the program charges in points.

The verdict

“AC Hotel Diagonal L’Illa is a four-star, 103-room Marriott Bonvoy property on Avinguda Diagonal 555 in Barcelona’s Tres Torres / Les Corts business-and-shopping district, directly beside the L’Illa Diagonal mall.”

Platinum breakfast benefit
No · Breakfast benefit for Platinum+ members.
Suite night awards
No · Suite Night Awards accepted at this property.
Free Wi-Fi for members
No · Complimentary internet where offered for members.
About the property

What makes AC Hotel Diagonal L´Illa worth the points.

The hotel occupies a modern building with an exposed brickwork, iron, and glass facade in a quiet residential neighborhood roughly two kilometres northwest of central Barcelona. It is positioned amid gardens and upscale boutiques, with convenient access to Camp Nou, the Royal Palace of Pedralbes, and transit links to the historic centre. Inside, the 103-room property offers complimentary Wi-Fi throughout, a fitness centre, on-site laundry, a terrace, garden, and coffee shop/café. The AC Lounge serves European-style breakfast in the morning, Mediterranean dishes at lunch and dinner, and hand-crafted cocktails in the evening. Marriott Bonvoy members receive free Wi-Fi and can use Mobile Key.

Timing

When to go.

Live · you're in July
Best time
Apr–Jun, Sep–Oct

Shoulder-season months offer mild, relatively dry weather around 14–21°C, fewer crowds, manageable prices, and good conditions for festivals and sightseeing without peak-summer heat.

Avoid
Jul–Aug

Hot, humid conditions coincide with peak tourist season, larger crowds, higher accommodation prices, stronger award demand, and some August closures.

From our review

A few more timing notes.

Business-and-shopping district location supports year-round corporate and leisure stays
Easy transit access to central Barcelona and Camp Nou makes the hotel practical regardless of season
Quiet Tres Torres residential setting offers a calmer base than the main tourist core during peak summer months
Fine print
  • · No official mention of a pool or spa at the property.
  • · The hotel is situated in a business-and-shopping district rather than Barcelona’s historic centre.
Book experiences

Tours & activities in Barcelona.

Tours and activities via Viator. Prices shown are live from Viator at page load. We may earn a commission if you book — hotel-booking commission policy unchanged.

FAQs · schema.org/FAQPage

What people ask about AC Hotel Diagonal L´Illa.

Data freshness
  • // editorial last reviewed 2026-06-30
  • // award pricing: see official Marriott Bonvoy award chart
  • // source: www.marriott.com

Cash rates are re-checked by hand; live award pricing comes straight from the program rather than a number we publish here — see methodology.

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