The room is not small at all and the bed is a very comfortable sofa bed. the fact that this room has its own entrance and toilet, makes it very private.
Miriam and Marty were great hosts. they were attentive but not at all intrusive.
Their house is withing walking distance to the Castro (with a few hills here and there on the way) and muni stations and the neighborhood is quiet and beautiful.
i would definitely stay here next time i go to San Francisco.