I think this bed and breakfast is the best you can find in London.
First of all it is in the city center near everything by the underground, the place is very nive near the Thames and the flat is very nice, clean and confortable to live. Moreover, Marie is the most kind woman I have ever met, she take care of you and is aware about everything... She helps you for everything.
I was there with my boyfriend and we have enjoyed our trip thanks to this lovely place and Marie. I can't help recomending this b and b to everybody!