Allessandro's recommendation : If you want to try the best steak and don't want to spend 50 euros per person, order Fillet with porcini mushrooms at restoraunt Perseus. This was THE BEST STEAK EVER IN MY LIFE.
The place is 20 mins away from the Firenze S.M.N station by bus. Don't forget to buy extra bus tickets when you return to the place because Tabacchi near Alessandro's place might not be open in early in the morning.