Really nice small apartment in a traditional old Portuguese family house and really close to the city center and almost everything that you should see in Porto. The place is really clean and fairly quiet, the only problem is that it's a bit cold during winter (as it only has a small gas heater) and there is not that much hot water (only there for a 5-10 min shower).
But all in all a great place to stay and a great location to start your adventures in Porto.