Mario's place in Porto is very nice! It was just as it looked like in the pictures, very clean and super easy to access. Mario replied almost instantly to every message and was a really good host throughout the trip.
The apartment is in a good place, very close to the harbor and the old town. It is based on a main street, which was relatively busy during the day. At night it was relatively quiet and enjoyable.
Would do again 10/10, thanks Mario!