We had a really great stay at Maria's apartment. Everything was clean and tidy and the location is awesome for discovering Porto. The parking spot is very useful in the city center as you will do all the sightseeing by foot. The street outside is very busy as bus lines go by, so bare in mind to bring some earplugs if you are a light sleeper.
Overall we had a great stay and would gladly come back. Thank you for having us!