We really enjoyed our stay at Carlos' apartment. Carlos kindly let us drop our bags at the apartment when we arrived after an early flight and gave us a set of keys so that we could return when we wanted after the apartment had been cleaned.
The apartment is conveniently located near the Trinidade metro station and is an easy walk into Porto. The apartment is well equipped, with easy to use washing machine, dishwasher, coffee machine, etc.
All in all we thoroughly enjoyed having Carlos' apartment as our base to explore the beautiful city of Porto.