The biggest problem with this rental is the fact that you're not technically renting a whole house. There is a long term rental unit directly below the Airbnb, which would not have been an issue except that each time during the two times I've stayed here, late night noise has been a problem. Longer back story below:
We're a small business that occasionally travels to Portland for business. The place itself is pretty nice, well decorated and clean. During my first stay, there was really loud conversation late at night (11pm/12am-ish). I communicated with agents of the managing rental company (White Spider) and resolved it. Chalked it up to a one-time incident. During my second stay however, I was asleep when I was suddenly woken up to the sound of loud music playing at 2:45am. Apparently there was a party downstairs. I went outside and saw some party goers arriving to the downstairs unit and told them to tell the organizer to turn down the music, which only resulted in a slight lowering of the volume. The house is a typical wood frame house, and the bass just carries right through the structure. I ended up calling the police and the officer was able to stop the music at around 4am. Mind you this was on a Tuesday night.
The rental company was apologetic the next day, and sent us a bottle of wine as a token, which was appreciated. But the fact remains, there's another unit directly below the Airbnb. I think you're coming to Portland as a party-goer and will be staying out late, maybe it's not a problem. But for us, doing business during the day and requiring a quiet place at night to rest, it didn't work out so well. I would hesitate before staying at this place again.