I’m a lifetime platinum member. Have stayed in 100s of Marriott properties the world over. In April 2024 had two back to back stays at the London Marriott Grosvenor Square and can honestly say it was among the top overall experiences I’ve had. The property is very well maintained. The location near Hyde Park / Buckingham is walking distance to the vast majority of fun spots in London (a city I know well and love). The M lounge was an absolute treasure — great breakfasts, canepes / snacks in the afternoon, wine in the evening, and some fantastic hot chocolate and coffee available 24/7. What really stood out was the service, both at the front desk and in the M Lounge. The woman who runs room allocation (I believe her name is Kimberly but I could be wrong) was incredibly helpful in arranging for gorgeous upgraded rooms for me and my family. Francesco at the front desk went out of his way to make sure every detail of the stay was perfect. I was celebrating my birthday and even had a bottle of wine, a balloon, treats and a hand written card show up at the room from the staff. And the M lounge staff were absolutely amazing. We felt we were treated like royalty and it was among the absolute best experiences we’ve had. And as I lifetime Platinum member, I don’t say that lightly. Book a room and see what I mean!