We were welcomed by Lisa at the apartment and the check-in was very complicated. Lisa is very friendly and helpful - she gave us some great tips on what to do/visit/eat in Porto, as well as where to find close by shops and bakeries.
The apartment it self was very clean, well furnished with all the essentials. It is located in the basement of a small house, so it's a bit humid, but there's a dehumidifier working non-stop so it's ok. The apartment is close to the city centre, many of Porto's tourist attractions and great restaurants. We went by foot the entire time we were in Porto since everything was in a convenient distance from the place.