The apartment was super clean and modern, the entrance into the building and apartment were simple and you don't have to worry about carrying a key around the city. I love that.
the private room has a key, which was a great relief in this shared flathotel.
Th apartment is super close to everything you could want to see in Porto. I would recommend the apartment and I would come back.
My only complaint were the guests staying at the same time were loud. I had to wear earplugs every night and when the lights come on, they reflect through the semi transparent windows high above the doors.