Ethan is a great host - it was my first experience with Airbnb and it was great.
Ethan is very well organized (managed to provide me with a replacement key from my room within minutes after the previous guest lost it) and the house itself reflects that its owner is taking care of it (room, kitchen, bathroom, corridors and overall the whole house were perfectly clean, as I expected), so I felt like at home from the moment Ethan welcomed me and provided me with tips on where to go and what to visit around Cupertino.
Logistically spoken, I find that the house is very conveniently located and in a great neighborhood (low crime, mid-upper class, easy to park). Great access from the highway, 5 minutes drive to the closest Safeway and plenty of other shops and yet very quite during the night to sleep well or to concentrate and work when needed.
So, overall, very good experience - would definitely recommend it to friends and repeat myself when around this area.