We stayed here for the SF marathon this past weekend. Nothin I can say that hasn't already been said about this location and it's host! Peter was great, kind, always available if we needed anything, and provided nice accommodations in the bustling tourist hub of San Fran.
You are literally steps from amazing food, coffee, and popular destinations like Lombard St, fishermans wharf, etc. Only negatives were that after 7+ hrs of driving, we were told minutes from arrival that previous guests hadn't checked out yet (it was 3pm, checkout was noon) and we would have to drive around more until Peter could change the sheets. We obliged (what else were we to do?), dropped off our luggage and bikes, and spent the next few hours roaming, exhausted, around the area via car. Once we did get into the unit, it had been cleaned up (though we wondered about the bathroom as it always had a mildew smell of wet towels/bathmats). I will also restate what others have mentioned: while this is a private downstairs area in Peter's personal residence - and we expected as much - noise can travel from upstairs pretty easily so bring ear plugs if you have an early morning (marathon) and need your beauty rest during a dinner party :)
Regardless, we would definitely consider coming back. I can imagine an extended stay in this unit is perfect as its affordable and has all the amenities. Peter (and Haley!) were very hospitable, and again, the location can't be beat.