We were surprised at the high ratings for this apartment. The shower had quite a lot of black mold growing in it and the water did not stay hot for more than 5-10 minutes (not long enough for more than 1 person to take a hot shower). Apart from this, the apartment was fine (quiet location, relatively central) but did not feel like a good value - we paid just slightly more to stay in a hotel in Lisbon right before this and that was much cleaner and more comfortable (bed & pillows, heating, etc). We would probably look elsewhere to stay for a future visit to Porto.