My family - five adults - stayed in this stunning, authentic and well-located home and had a wonderful time. It was very rainy during our stay so we didn’t have the opportunity to enjoy the deck which is just spectacular with amazing views of the Dom Luis bridge, the Duoro and Vila Nova de Gaia. The house is walking distance from the Sao Bento train station.
The bedrooms are spread over three floors, so keep that in mind while booking. Stairs to the main kitchen/dining level are open without rails or walls, so could be a safety issue for smaller children.
As other reviews have noted, there is an odor that is noticeable on the top floor but I associate it with pipes/plumbing and not with cleanliness.
All that said, we highly recommend this house for future travelers.