I booked Vascos appartment for my parents and they really liked their stay there. Especially they said that the place was very clean and that is something they really care about. The check-in was super easy as well as the check-out. Even when they contacted Vasco that they would be there earlier, it was no problem at all. The communication with Vasco was uncomplicated, although I did not book his place for myself. The nice square in front of the building makes a great view and there are a lot of restaurants just steps away. That makes it a little louder at night, but even my parents like that when they do a city trip. The appartment itself serves everything you need and is stylish in its apperiance.
Thanks again and I if go to Porto I would definitely stay there!