If you are looking for a central place to stay in Porto I would always recommend Joanas apartment. It is very centrally located but still quiet and relaxing (the terrace is of course a big plus). Everything was clean, the apartment is well equipped and communication with Joana/Beatrix was always easy. The only two things people should be aware of is that the living and dining room do not have much daylight and tall people should be conscious about the low ceiling in the hallway.