Maria's Castro Sanctuary was one little paradise in Frisco. After a longer trip to Alaska, we were more than happy to spend four days in this very comfortable and cozy apartment. The Sanctuary is a stylish, modern flat with everything you need for your pleasant stay in Frisco, very close to Castro and as Maria writes, easy to reach with public transport (though, don't try to walk up the 21st from the BART station as we did - you'd get a perfect impression of the SF hills ;)). All in all, we highly recommend the Castro Sanctuary!
We didn't see Maria but she was a really nice and caring 'remote' host and guided us through our stay by messages. Thanks for this excellent first experience with airbnb!