Mario's place is centrally located to everything. It's right across from the historical Sao Bento train station - a sight worth checking out itself. The apartment is clean, spacious and well equipped with everything you'd need. It also has an elevator which was a big plus for luggages. Mario's son helped check me in and showed me around the apartment. He was very responsive and helpful during the process and patiently waited for me as I arrived late at night. I'd highly recommend Mario's place to anyone visiting Porto.