We won't be in Florence, but I've read about several restaurants in Tuscany that offer Bistecca alla fiorentina. We will be staying about 30 minutes east of Siena, and traveling around the area, so what restaurant would you guys recommend we go to for Bistecca alla fiorentina?
In Panzano, the place to go for steak would be:
http://www.dariocecchini.com/dariocecchini/en/
You're not staying too far from there.
Dario is a legend! He has several restaurants and a butcher shop in lovely Panzano.