We had a great stay at Joana's apartment. We were slightly delayed by the metro, but she was waiting for us in front of the apartment. Joana then patiently explained all there was to know about the apartment, going into detail as to what sights to see in Porto and where to eat/drink. Location was excellent (just 10 minutes walking distance to the river) and apartment was very clean. We highly recommend Joana's apartment for future travellers to Porto.