This is one of the oldest European-style apartments I have ever stayed in and it was fabulous. To stay in a historic building with tall windows with a view of Sao Bento station was the highlight of our trip.
The apartment was huge, so huge and the bathroom was amazing although, if you are a tall/big person, the shower would have been a challenge for you.
All in all, I would stay here again and again. This was my 4th trip to Porto and I am sad I just found this apartment.