Bill's place is great! Nice and cosy, great location and overall perfect if you spend a few days in SF and around. It is really easy to find parking around and there are multiple dining areas in the neighborhood.
Also, Bill and his wife are very nice and welcoming! They gave us a lot of recommendations on what to visit and even shared one of their annual visit passes.
However, be aware that it is a basement apartment and there are no windows. The ventilation is good and there's no issue, except the lack of natural light.
The walls are a bit thin and you can hear a lot of noise early in the morning and during the day. If you're not a light sleeper, this should also be no problem.
Overall it's a clean place, however some pillows seemed used and it was a bit dusty. So if you have allergies, I don't really recommend it.