Andrew and Gina are very kind and very helpful. Gina is a long-time London resident and she in particular was around and available, but not at all in the way. Gina has her own space in the basement where she works during the week, but Andrew works elsewhere and was mostly only around on the weekend.
The space is lovely. It is homey, bright, and tastefully decorated. My wife and I enjoyed sitting in the garden or in the living room to chat, eat, and relax. But the best part is the location. When you stay with Andrew & Gina, you are very near to the subway (i.e, the "London Underground"), and almost equally close to the London Eye and the Shard. This puts you in close walking distance to many interesting sights and experiences... there are too many for me to list here, but Andrew and Gina provide all sorts of helpfully organized information and maps that make it easy to enjoy the city.
There is a bathtub and shower.