We really enjoyed our stay in Porto! Antonio gave us really good directions and he was very nice to keep our luggage until the check in time, as we arrived in the morning. The apartment is very well located, near to many restaurants, 5 minutes from the metro and train station S Bento and within 10-15 min walking from the main attractions of old Porto. It was all very convenient. Although we didn't spend too much time at the apartment, it's well equipped if you want to cook some breakfast and it has a nice interior terrace.
Although it didn't bother us, as the apartment is located on the first floor of quite a buzzing street, it can be a bit noisy during the night.
For us it was perfect and we'd gladly recommend it to other travellers.