Lee's place is an excellent option that I'd highly recommend if you're in Portland. It is tiny as described but is well set out and has everything you need.
Public transport into and around the city from the Tiny House's location is super easy and the local Alberta Arts neighborhood is great to explore.
We never me Lee in person, but she was in constant contact via message and was very accomodating about getting the place ready early for us on the day we checked in.
We had a great time in Portland, made even better by staying in the Tiny House.