The check-in experience was one of the best we ever had: Antonio was waiting for us at the airport and drove us straight to the apartment while giving all kinds of tips for our stay (being a local to Porto).
The apartment itself was very spacious and could easily fit our family of four (we have one toddler and one baby), including two modern bathrooms. There are two elevators which came in handy to bring everything up. There were also some thoughtful amenities, like a trolley to go to the supermarket.
The apartment is also well connected to the city: it is within 1 minute of a metro stop, there is a taxi rank right behind the little chapel uphill, and also some main bus lines within easy walking distance.
Overall we would recommend anyone to stay here!