The apartment has a perfect location. It allows you to visit the city walking around, no need to take any public transport. It is also as shown in the pictures.
The apartment is very well equipped. We had gel, shampoo, oil to cook, etc.
Mario was very kind. He was waiting for us the day of our arrival, and he answered quickly to all of my questions. Always available for everything we needed. He was also flexible with the check in and check out - depending on the next, and previous guests of course.
The building is old and due to this fact there is not general heating. Mario provides a heater for the whole apartment (the electric network doesn't support more than one), so it is cold inside if you go on winter.
Due to its location in the center of Porto, it's a bit noisy during the nights. But that's obviously the price to pay for being in the center.
In general we spent a good time in this beautiful city. And I forgot to say that everything was very clean in the apartment!