I was there with my son for five weeks, while looking for a long-term rental in Porto. Norberto and his family are the perfect hosts - they're warm, both responsive and discrete, which is an amazing combo. They were at hand every time we needed anything, and offered even before we had the time to ask. The apartment is spacious, well-kept, with all the amenities you can need (and bathroom is fab). The three bedrooms are spacious and separated enough to allow for privacy even for bigger groups. The balcony has sunshine for almost the entire day (I work from home so had all the time to see that) and the light is perfect. Cleaning service was always timely (and included in the rate).
Location is very good if you're looking for a base to explore the city - has plenty bus connections to both Matosinhos (beach) and town centre, lots of shops nearby, and a mall at 5 minutes by Uber (should you really need that).
Overall I could not recommend it more. Transition periods and moving are hard, but this place and family have such a good energy to them that we felt at home from the first moment, and it made a world of difference.