Very nice studio in the very centre of Porto, easy to get to and with all the tourist places you'd want to visit within walking distance. The studio itself is a good size with everything you need and is nicely decorated.
The studio faces out onto a main road and is opposite a bus stop so I'd recommend wearing earplugs to sleep as you do hear everything inside all throughout the day even with windows and blinds closed. You can also hear the loud sound of people from other flats coming up and down the stairs and the stomping of the flat above. Aside from that it was a very lovely stay and would likely stay here again.