I stayed at Carmen's apartment for over 4 weeks. This was an all around wonderful experience - London, the location, the apartment, and the hosts. I am a light sleeper, and this was described as a quiet place, and indeed it was perfect for me. The apartment is very nicely furnished and decorated, and the kitchen is very well equipped and stocked for a longer stay.
The location was ideal - Kensington is lovely, walking distance to Kensington Park and (a bit further) Hyde Park, as well as two excellent grocery stores (Whole Foods and Marks & Spencer) within less then 5 minutes walking. The Underground station is 2 minutes walking away and goes straight to the center of London (and other places).
The hosts were fabulous. They had good insights into places to go, restaurants, entertainment, and they are very personable. Overall it felt more like staying at a friend's place.
I would definitely want to stay here again on another trip to London.