Susan is a great host. I stayed at her place for a month and a half over the summer during my internship. She is very welcoming and her place, which is neat and exceedingly well-maintained, will make you feel at home. She is a true San Francisco local and you will definitely have insightful conversations with her if you stay with her.
Even though the room itself was small, it is very comfortable, and the rest of the house provides a nice open work/leisure environment.
In addition, Alamo Square itself is just a nice neighborhood. It's calm but is surrounded by a lot of things to do.