Luis was a great and friendly host! We were warmly welcomed with wine and fruits, checked in with us daily (via Airbnb message) and gave suggestions on what to see and do. He was very flexible as well; we were able to check out late as the next guests will only arrive at night.
Located along a pedestrian-only street, there's a supermarket less than 2 minutes away and it's right beside the "art street" of Porto. On Saturday there's a small but lovely market at the nearby square as well. It's at the end of the historical center, but still a comfortable walking distance away from Sao Bento train station and most sights.
The apartment is clean and very well equipped. There's a heater and thick blankets, which was great for winter. We had a small problem with the stove, which took awhile to heat up and made cooking problematic but not impossible. Pots were not in the best condition. We eventually used the microwave, which looked new and works great so yay.
Overall I would recommend the apartment for a short stay. Thanks Luis.