I've been at Suellen & David's house for a week. All I can say is that I highly recommend that place if you plan to visit San Francisco or the region.
First of all, if you land at SFO, you can take the BART until Macarthur Station, you'll save more money and avoid all the traffic around SF, then you can directly walk there or order a Uber. When you're at home, it only takes you 10-15 minutes to walk to the Macarthur Station, and the BART takes you to downtown SF in only 15-20 minutes, for less than 5 bucks.
In the house, you've your room with a very comfortable bed and your own bathroom. You can also enjoy a relaxing moment in the backyard, either on the bench/hamac or in the hot tub.
Suellen & David are very nice people, they will make you feel home there. You can feel free to ask them anything, they will definitely answer all of your questions and give you good advice for activities and spots to discover around there.
If I come back to the Bay Area, I will definitely go back there !