Our trip to San Francisco was great and part of that was due to our stay at the Bunkhouse. It was A quick walk to the conference center and it was in the middle of tons of shops and restaurants. The room was clean and very basic but it's all we needed. I highly recommend staying here if you're looking for a nice but no-frills hotel room.
Also they have a lounge and kitchen on the second floor but we didn't find out about that until our last day there.