We stayed at Gregg's place for four nights. The house and room was exactly as described and far exceeded our expectations. The bed in the guest room was super comfortable, like sleeping on a cloud, which was fantastic after a long haul flight.
Location was perfect, with fantastic food close by and easy access to all the sights around SF.
Gregg was the perfect host, we really couldn't have asked more for our first Airbnb experience. We'll definitely stay again next time we're in San Francisco. Gregg also makes the best banana bread ever :)