This is a beautiful, bright apartment in a very lively, centrally located area of the city. The hosts, although we didn't meet them in person, were very responsive online and provided lots of good information about the city and area.
The area in front of the apartment can be quite lively, especially on the weekend, but the apartment itself was quite quiet and has great internal shutters to block out all light and sound at night.
One of the last three trams in Porto has a stop right nearby along the pleasant park (Joao Chagas) and square and the Clerigos Tower is just a short walk away. This is a great starting point for any visit to Porto.