My girlfriend and I stayed 4 nights at Karin's place in Oakland. This was among the best Airbnb experiences we've had so far. Karin was kind and sweet and very easy to speak to. We had lots of great conversations with her. Karins place is within walking distance from busses going to both downtown SF and Oakland.
The room was squeaky clean and the bed was very comfortable. We shared the bathroom with other guests which was not at all a problem. The room also has an amazing view over San Francisco and the bay area.
So if a sweet host, a comfy bed and a breathtaking view is among you wishes: stay at Karin's place :)