My friend and I stayed at Traci's house when we were in Berkeley for a conference. The hosts are very nice, and incredibly helpful. They gave us all instructions to get around the city as well as to enjoy California as tourists.
The room is very spacious and it is located near the bus stop, but most things are at a walking distance anyway.
If I ever get to Berkeley again, I am definitely planning to check if the room is available, and I highly recommend it.