Can't say enough good things about Jack and Cris's place. This beautiful vintage craftsman is easy to get to from I-5. There's a major arterial (Powell) with a bus line just five blocks away, so you're handy to downtown, but the surrounding neighborhood is quiet, and if you like you can just stay in and shut out the city. Hop out to dinner and a show or stay in and cook yourself a meal in the charming old kitchen.
The house and bedrooms afford plenty of privacy if that's what you like. But personally, I suggest that you at least introduce yourself to the other guests and maybe compare travel notes or consider sharing a meal. Between the garden, the drawing room, and the spacious kitchen, you'll find that this place is conducive to socializing. To me, that's one of the perks of the Airbnb thing: meeting people.
Price was super reasonable. I booked a few days before New Year and got a great rate for the holiday. I don't know if that was a one-off deal or what, but regardless, I wish I'd booked for a week or two instead of one night. This is the way to "do" Portland, in my opinion.