We stayed at Chas' place for three nights. It is located in Castro, the district with lots of homosexual people living there.
The apartment was elegantly and well-furnished. Chas had some really nice appliances installed in his pad.
The cats were sweet, too. But what we didn't like that they were lying in our beds when we arrived and scattered their hair all over our pillows. Please take well into consideration that the guest is responsible for feeding the cats and cleaning after them.
The wi-fi was fast and reliable and Chas had a big flat screen in his living room though we didn't use it.
In front of the apartment was a cozy garden pond with chairs around it - great to read a book or listen to music.
The public transit station is just two blocks away and takes about half an hour to dt and 45min to Fisherman's Wharf/Pier 39.
For tourists the best way to explore S.F. is the City Pass. It has tours included and public transit.
In general I can recommend Chas' place. For animal lover's this is a great stay.