We really enjoyed our stay here! the space is used very efficiently and the location allowes you to walk everywhere (remember it's Porto so it's all up and down hill!)
The self check-in worked smoothly and the room was clean. There are some nice cafès and restaurant downstairs with lovely atmosphere. As other people wrote, because of the wooden floor you can really hear people walking in the upper floor or when walking in from the main entrance door, and during the day and evening (although until reasonable time) you can hear the music from the café downstairs, so it might not be ideal for you if you are a light sleeper and need absolute silence, but for us it was no problem at all. We would stay again :)