This is a great place to stay for a few days in Seattle. On the plus side, the place is spacious (for 2 people) and clean, and it is in a quiet neighborhood. The kitchen is well equipped, with extra touches like coffee beans ready to go in a burr grinder. Keith is a great host, too - he is accommodating and quick to respond to email, and he also has lots of useful suggestions for visitors.
If I have to come up with criticisms, I'd chiefly cite the location, which is a bit out of the way. If you are a good walker, it takes roughly 30-35 minutes to walk to the space needle, perhaps a bit more, or it'll cost you 10 bucks for a ride. Also, the place is dated, both as far as the furniture as well as the kitchen and bath.
However, it is clean, well maintained, and I think it is an excellent value for the money. I'd stay there again in a heartbeat, and I'd recommend Keith as a wonderful host.