AMAZING place! It is a no muss no fuss hotel room, that is clean and tidy. There are limited amenities compared to traditional hotels, i.e. no turn down service, no room service etc.. However, I really don't need those services anyway and it was worth the money I saved. The hotel does not have AC but you don't really need it as SF is rarely has temps above 70F at night. The room has a minimalistic hipster vibe. A lot of reclaimed wood and free floating shelves. However, it looks tidy and well put together (honestly a LOT better than the aloft I stayed in Atl the week prior). There were large pump bottles of shampoo, conditioner, shower gel and soap in the small yet very up to date bathroom (the ceramic bathtub was slightly larger than mine at home, and the water heater worked really well). The hotel definitely had a "less is more" styling attitude, but it 100% works, and the Hilton, Marriot and Aloft chains can definitely take a leaf out of that book.
The location was also great, being so close to union square. The Bart takes you directly from the airport to Powell street station, which is about 2 blocks away from the hotel.
Travelers tip: Get the clipper card, which works both on the bart and SF municipal transport, (the MUNI passport does not work on Bart trains). That way you can get everywhere for fairly cheap.