We had such a wonderful time in San Francisco. Mario was beyond helpful - posting house keys to Australia, emailing detailed directions for places I wanted to visit and being constantly available via email if I had any questions/issues - and basically checking we were ok.
Hayes St was half a block over which was great for coffee and eating out as was the public transport system - easy peasy.
We loved Mario's apartment and would highly recommend it for your stay in San Francisco. It was beautifully decorated with quirky retro pieces and really secure. Thanks Mario