A real gem.
Location is awesome: the subway stations (both Knightsbridge and South Kensington) are within walk minutes. It is very convenient to access most "tourist" locations. Flat is also close to all shopping facilities that will make your stay enjoyable (not to mention the Carpo coffee.) Hyde Park is also within minutes, for those who wants to go running... (or just enjoy a walk amongst squirrels).
Flat is very stylish, spatious and comfortable. The photographs are all accurate. It is 100% clean, well-equiped, and in a very quiet area. (Also: heating works perfectly.)
Suzy is a great host, helpful and arranging. Communication with her was perfect.
We'll certainly be back there on our next London visit.