This is a tiny restaurant in matosinhos, when we went, it was full and had to wait for about 30 min, so if you drop around, be sure to do it early, by the way, finding a place to park the car is not easy either.
While we were waiting, the waiter came and show us the fish available to choose. I love when they do it this way, you can see how fresh it is, the size and the type of fish, since fish names in Portuguese doesn't mean anything to me. They had 3 or 4 fishes, all different and clearly line-caught, so we choose one of them (don't remember the name) with a size enough for the 2 of us. It was delicious.
Beside this, we order a "Caldo Verde", great local soup, a salad, fresh and tasty. Desserts are a must as well, we try the home-made cheese cake, but all of them look great.
For drinking we choose the house wine, a green one ( Vino verde), great as all we had in this place.
I would definitelly repeat here if we visit Oporto again.