I had a perfect stay in Sarah's garden house. I felt very welcome when I arrived. Reception was exceptional as well as the the goodies that were in the room. No detail was overlooked. This is not a commercial 21st century/luxury 5 * hotel experience; this is how "bed & breakfast" was meant to be when it started.
Connections to public transport are within a 10 minutes walk (bus and train). Very easy to get around London from here.
If you are tired of the popular London neighborhoods you will be pleasantly surprised by the local character of Barnes and Mortlake. In Spring and Summer it will be great to enjoy the riverside.
Don't forget you are in the west of London and you will hear the big planes landing at Heathrow. No worries: earplugs are provided if you are a light sleeper.
The beds are big and comfortable. On cold days the electric heater will provide all the warmth you need. The bathroom has all the necessities.