This "casita" is exactly that - a small, bedroom-and-washroom house. While it does not have full cooking facilities, it had everything we needed (microwave, fridge, coffee-making equipment), and was better supplied than most Airbnbs we have rented. It was comfortable, and (maybe a bit surprisingly because it is not far from the freeway) completely quiet. It has a nice outdoor patio with chairs too.
Jennifer made us feel most welcome.
As for location - it is a 5 minute walk from the Balboa Park transit station (on the BART line to the airport, and the terminus of three separate Muni lines to the heart of the city). Especially if you are in San Francisco without a car, this location works extremely well.
We would certainly stay here again when we return to San Francisco.