We recently stayed with my parents at Mouzinho 134 for 2 nights and had a fantastic time. We were personally greeted by Eugenia with lots of extremely helpful information about the local area (restaurants/walks/shops/local history). The apartment was very comfortable/bright and very central (only a few minutes walk to the river and local attractions). It was located in a beautiful old building with lots of charm within the historic old center. I cant think of a nicer place to stay in Porto