The property itself is great, super location in the hip neighbourhood of Marylebone, within walking distance of Mayfair and Soho. I have stayed here before and liked it. They have a real gym with a large indoor pool, cardio, weights, cross-fit and much more.
A nice bar although they seem short staffed, and a good breakfast restaurant, though they sometimes don't quite get your order right, both of which for a 5 star property, should not be a problem.
My room was nice, real king size bed, and I love the small bottle of milk for my coffee in the room, and a proper selection of coffee (and enough of it).
However the room was very noisy, no soundproofing, almost as if people was in your room as they walked by. Also, the front office crew is not alway very helpful, not 5 star service.