We stayed in Alex' s flat for a long weekend and were really happy with the experience. The flat was exactly as listed, nice and clean and well equipped. It easily accomodated our family of two adults and two children under three.
The location is in a "well-heeled" residential area, quiet and safe. There are good tube links from Gloucester Road and supermarkets and restaurants are only a short walk.
Communication was very good both prior to and during our stay, questions we had were promptly answered.
We'd recommend both the flat and Alex as the host.