My boyfriend and I stayed at Cristiano’s for two nights during our visit to Porto, and it was a wonderful Airbnb. The room is large, with beautiful views of the city. And since it's upstairs from the rest of the apartment, it feels like you have your own little space.
The apartment is just a short walk from the train station (7 minutes, maybe?), so it was easy to get there, and to get around. Plus, Cristiano gave us great tips on places to eat, which was helpful too. I'd definitely stay here again.