Staying at John's place was exactly as we expected. The flat was clean and comfortable located in a quiet and well served area (Starbuck's, Wallgreens. restaurants etc..)
It was very nice of John to provide us with 2 cards for the metro. The metro is about 30 minutes walk from the flat and it takes you to San Francisco's city centre in about 15 minutes. Parking in the area is free and it is easy enough to find a spot.
Overall nice experience, absolutely recommended!