Great place to stay. For our family with young kids, Joan and Adam's place was just perfect.
If it's not in the city centre, it's very easy and pretty quick to go downtown by bus or train. Also, neighborhood is very nice, with food shopping and a choice of various restaurants.
The place is very quiet and big enough for a family. Probably even nicer for 2 people, with the bedroom and the living room. It's really cool to have breakfast bought/planned by our hosts + the place allows light dinner.
Joan and Adam were fully available for questions or services during our whole stay, very reactive with the few questions we had or advices we needed.
We would definitely recommend it for those who want to discover San Francisco and its surroundings while staying a bit outside of the city centre and its noise. We loved it!!!