Our stay as Esther's apartment was near perfect. The room has everything to give you a good night of sleep. You have a small fridge to store your food, a microwave and a toaster. The neighborhood is very peaceful and quiet. Within 15 minutes, you have access to a BART (which brings you within 15 minutes to downtown San Francisco), a grocery and restaurants. Esther provided us Clipper cards for the BART, a really nice attention !
The only con about our stay is the WIFI. Being from Canada, we couldn't freely use our cellphones as data fees are expansive in the US. We needed WIFI to plan our trip, book some reservation (like bike rentals), etc. Esther's WIFI was either very slow or not working, as she closes her router and modem when she leaves home and during the night, leaving us with no Internet when we needed it.
Overall, our stay would have been perfect if it wasn't for the WIFI issue.