Jan's place is wonderful, and so is Jan.
The location is terrific--easy to reach from the airport by BART, the Muni J train takes you right downtown, and you can walk to all the great shops and restaurants in the Mission district.
The room and attached bath are spacious; the rest of the apartment comfortably furnished and decorated with exceptional art. There's always a quick breakfast available in the kitchen, and plenty of good breakfast places just around one corner or another.
Jan herself is excellent company; we had several conversations that we had to end prematurely to ensure getting to the other City attractions we wanted to take in during our too-brief stay!
Our highest recommendation: we'll always contact Jan first when we're coming to San Francisco.