Our stay at Gisela's was very nice! The location is perfect and we found the apartment super clean, just as shown on the pictures. Gisela was there to welcome us even though we arrived pretty late, and was very reactive when we needed to reach out to her. She even gave us the name of a few good spots for breakfast or lunch, and museums to visit.
At night time, the street can be a bit noisy but it's not impossible to live with and I guess it's part of the experience, Portuguese people like going out :)
To sum up I would totally recommend the Fabrica House and will come back there when I decide to go to Porto again !