We really liked staying in this apartment. It was an excellent value for the price. The bedroom and the bathroom are actually bigger than what they look like in the pictures. The place was very clean when we checked in and the cleaner came in again mid-stay (of our two week stay) which was super convenient. The location is great, nice and quiet and about a 10-15 minute walk from the city center. While the metro station is right nearby, we just walked everywhere because it's that close. There are cafes, restaurants and a couple grocery stores nearby. There are several laundromats in the proximity if you need to wash your clothes during the stay. Internet was fast and reliable with Netflix installed on the TV so you can log in to your account (nice touch). The only one inconvenience is that we could hear people walking around in the apartment upstairs.
António is easy to reach and answered all of our questions very quickly. He gave us helpful tips on what to do in Porto when we checked in. I would definitely recommend this apartment.