Apartment in a great location with a nice, minimalist design. I appreciated the private outdoor space, too.
It's very well equipped, with e.g. a dishwasher and a decent hair dryer, going beyond your typical vacation rental.
The building is on a quiet street, with a few nice shops and cafés, close to the center, and with easy access to the metro.
The apartment itself is facing the courtyard, so no street noise at all. In case you're very sensitive to noise: You can hear steps form the apartment above occasionally, and people entering or leaving the building, as the apartment is on the ground floor. Didn't bother me though, and is kind of expected in a building with other apartments.
Communication was easy and responsive throughout.
The only thing that did go slightly wrong was my check in. It turned out the apartment wasn't ready at the agreed time, so I had to leave again and wait for anther two hours, which was bit unfortunate after a very early flight and a long day of travelling. I guess that was just bad luck on this particular day though, and I would still stay here again next time I'm in Porto!