Overall I would recommend this place. As it was quite cheap. The apartment is very central and Ingrid is the nicest person. She gave me so many recommendations, made my stay super easy and I felt very welcome.
The apartment and the room specifically was small but very clean and tidy. However, the bed was a little hard and the room was rather cold (it was cold when I was in Lisbon) but Ingrid offered me a small heating device (did not dare to have it on all night though) and an extra blanket. I don’t think this would be a problem in the summer though. If you are sensitive to noises, bring earplugs as the windows are not very well isolated and you hear the noises from the street outside.