This is a really excellent place to stay. Wonderful location, really fast and friendly check-in, a large space with a full kitchen (including gas stove and oven), comfortable furniture, cosy bed, a workspace or dining area, good shower, and good wifi. Close to everything you would want including cafes, restaurants, gay nightlife, other nightlife, supermarkets, all kinds of shops, the adventure and history of the Castro and the Mission, and transport all over the city. Fabulous! Highly recommended.
Minor weaknesses are the stairs with no handrail, street noise (trams outside, but the whole city is noisy), and not quite enough storage for clothes for two people. Also, it's expensive, but probably quite decent value for San Francisco which must be the most expensive city on the planet.