We enjoyed staying in Ana Sofia's apartment. She was there to greet us and left us some fruits as a welcome gift. She was very helpful in suggesting restaurants in the area. The apartment is compact and comfortable, and the TV has been upgraded since the photos where taken. We used the kitchen for cooking without any issues.
The apartment is located close to the old city area, but still quiet. It faces the back of building with a terrace. We heard some noise from people in the hallway and outside late at night, but nothing that was an issue.
We would recommend staying here when visiting Porto.