Excellent small apartment in a prime position for all the sightseeing you could wish to do in Porto. We had everything we needed and the air-conditioning was an added bonus during an unexpected heat wave.
It's on quite a busy street but quiet by the evening, unless it's the weekend, but even at that, the shutters do an great job of cutting out the noise.
My wife and I would recommend the apartment and would happily stay here again when we return to Porto, which we almost certainly will. It's a wonderful city.