Alex's apartment was excellent. It was sparkling clean and modernly designed with some nice touches. There is also a lovely balcony.
The apartment is located around 10 mins from Bolhao metro station, which includes an uphill walk. As Porto is a very walkable city, most attractions are around 30 minutes walk at most.
Alex was an excellent host, keeping in constant communication and upon arrival greeted us himself. He then showed us everything we need to know before telling us some local tips for both the main sights as well as some of his favourite restaurants and bars.
I would 100% recommend staying here.