I hadn't meant to eat at i Fratellini but after walking from Piazza della Republica I found myself there. It’s so much fun. There are other sandwich places that are really being touted now. I’ve tried some. The lines for all the popular sandwiches are long but it goes fast. Try the others as well if you have time and inclination for quick easy lunch. I love this hole in the wall place (it is exactly that) but a real part of Florentine local experience.