This place is just awesome, and I would highly recommend it to anyone. In terms of cost to value, this is probably the best place to stay in that area. I stayed there for business, but enjoyed it a lot.
The location is terrific, very quiet and peaceful, but with Valentino's market just around the corner and Union St with a lot of restaurants, shops and the lively crowd just a block away. What I especially liked is that it is not a typical touristic place. You will feel yourself like a local there.
The room is also great, nicely decorated and very clean. I didn't use various amenities a lot, but you would find there everything you need for an extended stay. There was no single thing I missed.
Regina is the great host, very friendly and attentive. If you are looking for a place to stay in SF for a while, don't miss this one.