We did go to the Adega e Presuntaria I which is located very close : compared to the "II" version it has no terrace and is hidden in a road nearby without any charme. So you would ask why go there? First the menu is exactly the same, so it's not about the food. What we do love is that it is quite: only a few locals go there and the waiter is the most charming man in the world! He for sure knows his job and takes time for you.
As for food, you have a large choice of local dishes one better than the other: you feel like cooking is made by your grand mother :)
To drink, take the red Douro from house, worth every penny!