We spent three days at Sheila's apartment and enjoyed it a lot.
The apartment was very clean and tidy and there is/was really nothing to complain about.
It's in a quiet and safe neighborhood and it's only a 10min walk from the Muni Station West Portal (public transport to Downtown San Francisco).
Sheila was a great host and very helpful, also because it was our first trip to SF, and she gave us great advice concerning the immediate neighborhood and San Francisco sightseeing.