We felt great during our stay at Susana and Paulo's apartment. We did not get the chance to meet them but their sister-in-law expected us and the check-in was very easy. The apartment was spacious, clean and comfortable and provided us with everything that we needed. There is a supermarket very close by and the metro station is at 10-12 minutes walking distance. A very nice feature that is not mentioned is that the hosts also give you a mobile hotspot device which you can take with you, providing you with an internet connection everywhere you go. We definitely recommend Susana and Paulo's place if you visit Porto!