Fantastic value for money in a very expensive city. Potrero Hill is a very clean neighbourhood, which felt very safe with fantastic views over the city. The no. 19 bus stops right outside the house for cheap access to the city (although we mainly used ubers).
The guest area is clean and spacious, with a comfortable bed and utensils for take out food. As the room is beneath the main house, you can hear noise from above from 7am, but we still got good sleep.
As stated in the listing, access is through the main house, so we were surprised Airbnbs lists as an "entire place". You can lock the door from the inside at night for privacy.