We stayed in Irinas apartment for 5 days and had a wonderful first experience with airbnb. The apartment is in the perfect area to explore the city, Fishermen's Warf, downtown, Chinatown, Union Square etc. are in walking distance. The neighborhood with little Italy and Chinatown and all its restaurants (try "the house" for great fish) and bars is wonderful.
Unfortunately we did not meet Irina, but Greg was a wonderful host. He gave us a lot of suggestions where to go.