10/10 would recommend this Airbnb. It is located right next to the river and has spectacular views! It's near all kinds of restaurants and attractions. Arlindo was a very helpful host and they even own a cute little wine bar directly below the apartment that you visit.
While we were there, a street performer playing soft piano set up outside on the street and we could listen with the doors open while we were getting ready in the evenings. I would definitely recommend staying here during your time in Porto!