This is a very nice space; clean, comfortable, and centrally located (to the metro area, it isn't right downtown). The view over the water is a bonus, and the deck is wonderful (well, would have been if it weren't rainy and just-barely-too-cool-out when I was there). The only downside, as others have mentioned, is that you can hear foot traffic upstairs. This isn't a problem (easy to ignore), but the first time you're in bed and hear a door open and footsteps, remind yourself that it must be the neighbors and not someone coming in to kill you. :D :D :D
Beyond the space, though, Dennis is a superhost which I think made a big difference when I was dealing with an AirBnB snafu. It was totally and completely their fault, not his, and when I messaged him in desperation he promptly used his superhost superpowers to talk to customer support and help them work with me to solve AirBnB's problem. I regret that it took him any time (as well as mine!), but he was a great partner in getting them sorted out.
I would definitely consider his place again when I go to Seattle.