The place is perfectly located in the centre of Porto and you can move around the city from there very comfortably. Everything is in walking distance and yet you don't have the tourist crowds right before your nose when you walk out the door.
Pedro is very quick in responding and the check-in went easily, although we arrived in the early morning. The apartment is nice and has everything you need for your stay. We were two people and it's very well manageable for a week as the room is quite big.
The square in front of the building is used by the restaurants and bars and also by locals to hang around so it can get louder in the evenings and nights, but if you bring ear plugs or join the party, you will be fine!
I can definitely recommend this place for a stay in Porto.