Ate here twice during a recent trip to Florence, it is the best, but expect a wait unless you are really lucky (as we were the first time which made it easy to wait for the second trip). You sit at group tables, but it all works out fine. The menu changes everyday. Go on Friday if you want to try interesting fish specials.
Open only for lunch so make this your main meal of the day.
After two visits some of the staff already knew us. If I lived there, I would eat there once a week.