We had a great time at Sergei's room.
The place was as described, very comfortable bed, with soft and scented blankets. The bathroom was well equipped with plenty of towels.
Sergei gave us a lot of info about san francisco e left soda and beers in the fridge at out disposal.
The house is in a very quiet neighborhood, there are free parkings and muni stops are very close. In a short walking distance there are restaurants, starbucks, cinema and safeway ...
The only negative thing is that the room was a bit humid and cold.
We highly recommend both the place and the host.