We really enjoyed staying at Bill's place. Making arrangements and planning our stay were easy and communication with Bill was great. We loved the location - Bernal Heights is a friendly neighbourhood with great restaurants and local shops, yet only a few miles from Downtown San francisco. We've stayed Downtown before, but staying in a local neighbourhood was so much nicer. We made good use of Lyft and found it really convenient. Later in our stay we had a hire car and parking was easy on nearby streets.
The apartment itself is in a basement and has no windows and natural light - this is clearly explained in the description so we knew this in advance. It has been well decorated and is well ventilated so we didn't really notice, it wasn't a problem for us at all. We didn't spend a huge amount of time in the apartment as there is SO much to do in SF. We are a family of four with two tall teens, and even though the apartment is small the size worked fine for us.
We really appreciated the extra touches and thoughtfulness in our stay - coffee, wine and crisps (chips if you're American ;-) ) on our arrival, plenty of towels, and the use of a guest pass for the California Academy of Sciences (which saved a small fortune). We would definitely book this apartment again, highly recommended.