Dave and Silke were amazingly welcoming, warm, and accommodating folks. I was flying into Portland late in the evening, and though I had told them I would be taking public transit from PDX to their place (it is easily accessible, and alternatively parking would be no problem), they called once I landed and offered to pick me up. We had a great conversation on the way to their house, and they are both so fun and nice that I was disappointed to not run into them more often during my stay, but I had a pretty packed dance card while in town.
The downstairs space they provide is fantastic: perfect temperature despite the slight chill in the air outside, amazing heated floors, and all the kitchen you'll want in Portland's foodie environment (i.e. a refrigerator and coffee/tea utilities, because you'll want to explore restaurants and food trucks). As one earlier reviewer mentioned, you can hear some activity from above, but unless you're a light sleeper and a late riser, it probably wouldn't be an issue. One more, unique thing, about the place: there are lots of fun instruments to spend some time playing with when you're not out enjoying the city or neighborhood - which probably means you won't spend much time with those instruments, as both the city and neighborhood are totally engaging. The Sellwood area, where their house is located, offers tons to explore within walking distance (admittedly I didn't get to do much exploring here) and is located pretty close to trails which run along the river; these trails, however you choose to take them, are beautiful and a great way to access the city as they run right downtown: if you're a runner, they're fantastic and offer a beautiful route for what can be a good distance (you can loop around the river, coming back - or going out - over the Sellwood Bridge near Dave and Silke's and crossing again on one of the bridges downtown, all while being on paved trails, and getting 10+ sightseeing-quality miles).
This trip to Portland had a pretty specific purpose for me, but whatever your agenda while in town, Dave and Silke's space seems like it would be a perfect place to serve as a home base.