I really enjoyed my stay in San Francisco and slept really well at Kathy's place. The bed was very comfortable! Kathy had lots of tips and offered me a Croissant every morning.
I learned that sharing a bathroom with other guests is not really my thing, so keep that in mind at this place. If that's not a big deal for you, this place is probably the best that you can get for the price in SF.
It's a few minute walk to the 16th Ave tile steps and about 25 minutes to the big park. The bus and train stop aren't too far away so getting around is quite easy.
If you have a very light sleep, you might want to bring earplugs because if the other guests snore loudly you will definitely hear that. I didn't mind the city noises so much though since it's a rather quiet area in my opinion. All in all it's a really nice place to stay for a few days.