I've stayed at many great Airbnbs, but this one by far was THE best. The location is far enough away from city house, but near enough for a short drive or Uber. We didn't take a car, but if you do, there is plenty of free street parking. The house is right on a corner so it's easy to find if you get lost or if you're getting an Uber pickup.
Cara and Roger were the kind of hosts that you can tell really put in effort to go above and beyond. They had a wonderful guide book with suggestions of things nearby, maps, tour pamphlets, information about what is stocked in the apartment, etc. I could live in that studio. All the basic cooking utensils and kitchen stock items were there, and there is even a washer-dryer. The bathroom has everything, even a hairdryer. The entire space was impressive, beautifully lit, and impeccably clean. I would absolutely guarantee that a stay with them would make your visit to Portland so enjoyable.