I had great time in San Francisco, and going downtown from Brenda's place was just easy, with only 25 mn tram from union square you can just go wherever you want.
Brenda and her room mate are great people, smily, opened, welcoming, and I loved discussing with them. "Bo" and Mumu are active participants in the atmosphere, welcoming you there way. It was just easy to live there, nearly like home.