It's a really nice apartment not far away from the city centre, the main attractions were accessible even by foot, but the metro is just next to the building. The hosts were really helpfull they replied straight away to all the questions and they even organized us transfer back ro the airport at 4.30 in the morning. There is a small restaurant just in front of the building, they do amazing francesinha, I recommend to try it. Overall we had a really nice 4 days in Porto