This is the kind of place I would regularly visit if I lived in Porto. The location is a bit obscure, but that creates a unique kind of atmosphere. It's a place where you can not only eat, but also hang out, have a few drinks, listen to music, and more.
We came on a Saturday night; in addition to lunches during the week days, they offer pizza on Friday and Saturday night. There were six different options, and two of them were vegetarian. The guy working also told us we could mix and match, so get one of the "meat" pizzas but with veggies instead, etc. This kind of flexibility would also allow you to get a vegan pizza, as long as you asked for no cheese.
The food was food, and fresh, and tasty. Two pizzas and two drinks came to less than €20.Pros: Great view , Tasty and inexpensive food, Laid-back vibe
Cons: Not 100% vegetarian like advertised