Our 4 day stay in Porto was great partly as a result staying in Joana's place. The room is huge and very clean. It is also quiet. This is my biggest requirement as I m a light sleeper. Amenities are adequate. It is definitely a great base to explore Porto.
The only issue is the 5 flight of stairs you need to climb in order to get to the apartment. Not ideal if you have mobility issues or huge luggages.
Overall. I would strongly recommend Joana's place if you are visiting Porto. .