Very nice and comfortable flat, well equipped and ideal for a long stay. Location is very good if you're ok walking a bit (it wasn't a problem at all for me since the weather was so great).
The road is a bit noisy with the window open even at night, but with the blinds down and the window closed you can sleep just fine.
Supermarket nearby, at walking distance from town centre, restaurants and shops reachable on foot. Overall I had a very good stay, will go back if I travel to Porto again!