The location to SF and to the airport can't be beat. It's probably going to be very foggy all the time there which keeps things interesting. Bring a sweater. Beds are very firm. Fridge is a mini. BYO wash cloths or loofahs. Wooden stairs can be slippery if you wear socks as well as the bathroom tile if it gets wet. There is a driveway to park in. If you need ample closet space, you'll have it.
The stay was very clean and wonderfully simple. Would definitely recommend.