For first timers- It’s not listed in their policy but prior to booking you must first be a verified user, and have at least one review from a previous stay through air bnb.
My boyfriend and I had a pleasant stay here at Alan’s studio. He was easy to get in contact with and quick to respond. He also provided detailed instructions on how to check in/find the place. We had no issues checking in and out. We appreciated the cleanliness and comforting vibe. This place is also modernized which is always a plus. Thank you for making my first time in San Francisco a conforting, easy one!