I would highly recommend staying at Helen's place. Her home is very close to the SFO airport (about 8 minutes). Her son helps manage the AirBnB - Helen and him were both quick to respond and helpful. The home is one of the cleanest I've ever stayed in. There were nice little touches such as a selection of shampoos, breakfast bars, Peet's coffee, etc. The check-in with the lock box was seamless. If ever in SFO, my friend and and I would love to stay here again!