We stayed with David and Susan for one night before an early morning flight out of PDX, so were only in the accommodation for a short time, but it was very clean, well-appointed and quiet. It is a basement unit below David and Susan's home, but relatively private considering that. You can hear a very small amount of noise from upstairs during the daytime but it was quiet at night and we slept well in the large and comfortable bed.
Tea and coffee making facilities are provided, as is a fridge. Laundry isn't generally allowed to be done but David was kind enough to allow us to do a load.
The accommodation also has access to a cute little garden area with a chairs, a table and a water feature, where you could sit and read, which we didn't do because we didn't really have time on this short stay.
The Concordia neighbourhood is charming and is close to the trendy, gentrified Alberta street. The neighbourhood, like much of Portland, is safe for walking around.
Based on our short stay, we would definitely stay at David and Susan's place again, hopefully for a longer stay next time.