Peter's Airbnb was an excellent value and location for our stay in SF. We also used his car rental service which he offered at a rate we wouldn't have been able to find anywhere else. Overall, we felt our stay was well worth it.
That said, there is no door separating the guest area from the common area in the front of his home. Peter is very respectful and lives upstairs anyway so we didn't feel he was in our way at all, but we did wish there had been a bit more of a feeling of privacy. We also felt the bathroom could have been a bit cleaner but it wasn't a major issue. I only say this so future guests are can go in with a full understanding of our experience.
Nonetheless, we would absolutely recommend Peter's Airbnb to anyone looking for an extremely well-located place to stay in SF at an unbeatable price.