Others have said it: here you can eat a lot for little money. And at the same time, it's tasty! This place is not the nearest to the tourist spots, so you'll have to walk a bit or use transportation, but it's worth it.
The atmosphere is a bit "young" for my taste, but the pluses made me go there a second time, when I sat in the front part rather than in the section behind. That was better already.
Cons: Amosphere must suit you, Not very central