Pretty nice place to stay if you want to visit the city. Very close to the main atractions of Porto, easy commute from the airport due to the close location of the metro station and many stores just outside the apartment.
Only thing that might be some kind of annoyence for some people might be the street,by the apartment, which is pretty busy. If you are born and raise in the city you won't notice the noise, but for some might be the issue.
Otherwise, all good.