I stayed 2 weeks at Noah's and found it to be the perfect introduction to San Francisco.
1) The location is amazing, 5 minutes from the 24th and Mission BART station, conveniently situated between Noe Valley and the Mission - i.e. walking distance from many cute coffee shops and restaurants. Noah provides a very useful - and on point - list of places to try around the Airbnb.
2) The studio itself is full of light, with its own bathroom, and opens up into the garden. The microwave/fridge/coffee maker came in handy. Everything was very clean, and I even managed to do my laundry (right outside the door, in the garage).
You do have to go in through the garage door but I didn't find this to be a problem since you do get your own entrance/privacy! Only 'negative' point is, you can hear footsteps from the floor above - that didn't bother me but might if you are a light sleeper. Other than that, Noah and his wife are the nicest - I had a great time and would recommend it to anyone looking for a convenient, safe and clean Airbnb place in San Francisco.