Mário's place was lovely! it's small but practical and has everything that you would need. We were only in Porto for a few days, but really enjoyed our time there, especially because we were so centrally located. We didn't want to have to take a taxi anywhere, and we didn't have to! There are a lot of cool places nearby that are walking distance, including the Clérigos Church which is literally right next to the window! We didn't get to meet Mário in person but we was very quick to respond to messages, which was appreciated. We were greeted by Rafael, Mario's friend who was very kind and welcoming. He even helped us carry our luggage up the stairs. All in all, we had a great stay.