I liked the apartment. Not perfect but good location (9 minutes walk to the subway and 30 minutes walk to the main sightseeing). It was very easy to get inside, but if you need to park your car, you will need to ask beforehand where is the parking place and remote control to open the door for the parking. There was no instruction on this.
The apartment needs repair because the walls were dirty and damaged. The tower holder in the bathroom seems to fall out at any moment. The blinds were dirty and not working well. The door lock seems to be broken and the door opened in the middle of the night. Pay attention to this and close the door with a key.
On the other hand, it was warm in the apartment in the evening and there are a lot of things to do in Porto :).
I would like to come back to Porto one day in the future. Thank you!