Me and my family stayed at Roger apartment for a week. The place is really nice decorated, comfortable and contains everything, even a hair dryer!
The apartment is part of a few buildings, at the main one there is a gym and a doorman. It's about ten minutes walk to the tube and to a large shopping mall. Also, it has a big grocery store about 5 minutes walk and a small one just outside the building.
Roger was really nice, fast reply every question I had. It was really comfortable for us cause we checked up late at night and he came the next morning to meet us and showed all around.
Highly recommend staying at his apartment while visiting London.