I strongly recommend the apartment and will certainly return when I visit Porto again.
The location is perfect - five minutes walk from Trindade Metro (with the direct E line to the airport), close to a large supermarket, shops, bars, tourist information office near the city hall, and the main sites.
It is very clean, spacious - with two good-sized double bedrooms and a kitchen/lounge. There is powerful air conditioning in the bedrooms and the electric shutters block all light. There is also strong WiFi throughout the apartment.
The kitchen is fully equipped for storing and making food and the bathroom is large.
Daynador was kind enough to leave some bottles of mineral water in the fridge. We also informed him of our late arrival, and two girls came shortly after we arrived to let us in.
Thanks for everything.