Absolutely fantastic! Excellent location in central London, ideal for visiting the Royal Albert Hall and the museums. About 15 minutes walk from the nearest tube station, and there are also buses nearby. Two supermarkets on the corner, so you can either buy ready-to-eat meals and nuke them in the microwave, or prepare more elaborate meals in the shared kithen, which has everything you could possibly need. Everything is super clean and neat. Again please note, the bathroom is up two flights of stairs, but is for your excluse use during your stay. Very comfortable bed.
Graham is an excellent and most considerate host. He even helped me exchange some old 5 pound notes which I had from a previous visit years ago. These are not easily exchangeable by tourists as you have to have a UK bank account. We had some interesting conversations over a cup of tea (which is also provided).
All in all I can highly recommend this experience, which is really in many ways better than a hotel.