For being located in a tourist mecca, this place offers excellent local food. Posted at the counter are your meat, cheese, veggie, and sauce options. I strongly recommend the gorgonzola with anything, because it's particularly strong here. You have the option of ham or salami and frankly you can't go wrong with either, or anything on the menu, for that matter. As a nice additional touch, they offer local wine even for outdoor customers. And for the affordability, you're practically wasting a trip to Florence by not at least trying what this gem of a shop has to offer.
If you're looking for ONE streetfood experience in Florence, this is THE place to have it.