Mario's apartment is very centrally located. Porto's popular shopping street is just around the corner, as well as the next metro station. Even Ribeira, the historical city centre down at Douro river, you reach within 15 minutes walk. Mario is a great and very engaged host. The rooms are very clean and nicely furnished. All in all I can only highly recommend this spot to other travellers. If I came back to Porto I would definitely prefer to stay at his place again!