Great location: in the middle of the Old Town!
There's some good options of the tapa-style foods (humus, rataouille-like things, etc.). My group ordered 6 small dishes plus wine for four people and was satisfied. They provide you with pita triangles to dip it in, which is nice! Our bill was about 12€ a person if I remember correctly.
Sit outside for good people-watching and entertainment by street performers.