Stay here! Look no further. I stayed in 3 Portland AirBnbs over my last trips there and this was by far the best value/location and environment. You get your own private floor with 2 bedrooms (1 queen and 1 twin) and a bathroom. The beds are comfy. I have a mild cat allergy so I was a bit worried since they do have 2 cute cats, but the cats are not allowed upstairs and there was no sign of cat hair anywhere. My allergies were fine.
There is a heater and an air conditioner. Ali and David are nice and welcoming. We kept mostly to ourselves and had a great stay here.

You can walk to great food and bars and the Kennedy School with it's pubs and warming pool. Go to Expatriate on 30th and Killingsworth and get the tea leaf salad.