David's place in Seattle was absolutely incredible! From the many snacks, beverages and wine left for guests to the immaculate state of the place, my two weeks there was just an all around positive experience and I hope to be back. I can't add too much to what others have written here, but all of the good stuff is definitely true. Though it probably needs to be noted again that you can see the lit up Space Needle from the upstairs bedroom window at night, which never gets old.
The one tip I would share is that you should try to talk to the host when you first arrive, because I didn't and, as a result, failed to learn some important nuances to getting around Seattle from his place until several days of unnecessarily torturing myself by walking up steep hills with bags of groceries and taking the least convenient bus lines. There is both a pizza place and a great stop for a bus headed downtown only about a block away (the 29 line). Once you get the hang of the buses and trains, Seattle can really open up for you.
That's all. Kudos to David for maintaining one of the best Airbnbs I have ever visited!