It was a really great time at Jay's place, very centrally located, and affordable. Of course, one mustn't expect a very large or luxurious room, but it was clean, quiet, equipped with WiFi and had in total a perfect price/performance-ratio :-) If one doesn't care about sharing bathrooms (which was never a problem to me).
Jay also invited me to try her anchovy pizza and even the thanksgiving turkey, but unfortunately these offers were always directly after dinner, so I did not try her meals ... still, it was very nice that she invited me. Further, her son recommended an ethiopian restaurant at Berkeley, which was definitely an impressive experience!
All-in-all: Thank's Jay for a great time at San Francisco!