Home of the original Negroni cocktail. Legend suggests that it was here (when it was called Caffé Casoni) that Count Camillo Negroni demanded the bartender make him a stiffer version of the Americano.
Home of the only cocktail recognised as Tuscan by the IBA (international bartender association). Ask for it just saying "un Negroni per favore"! More about it: http://bit.ly/1fCgkv5
Café Giacosa inside Palazzo Strozzi on via Tornabuoni - is a lovely place for good coffee, cake or light lunch. Never too crowded and plenty of seating in the internal courtyard.