I stayed one week at Jack's house, and it was perfect ! The room is clean, with all you need (extras blanket and towels, a big screen with Netflix Hulu and Amazon Prime, a lot of place for your clothe), you have shelves in the kitchen and the bathroom. The neighborhood is pleasant, with a lot of restaurants. Also, you can take many buses to go wherever you want in San Francisco.
Jack is a perfect host !! He thinks about many détails like snacks for the guests, labels in the house with little indications and he is always ready to help. When I arrived, he immediatly printed me the map of the neighborhood and showed me how to take the bus. He has always a big smile on his face, I really appreciated talking with him about many different subjects. At the same time, he respects your privacy. And, as a photographer, he offers you a shooting. I left with a really good and original souvenir !
I couldn't imagine a better stay in San Francisco !