We found a good thing - Thursday nights at Chiaroscuro, a little cafe on Via del Corso, they have sushi and some other Japanese food, along with a bunch of Italian dishes. The best part is that if you buy a drink, the buffet is only 7 Euros, for both. That's right - seven Euros for a cocktail and what basically everyone else there including us turned into dinner. The food was really good and so was the Mojito. It was a mixed and friendly crowd, and has to be one of the best deals in Florence.
Micasushi, Thursday nights at Chiaroscuro, Via del Corso, 36r Tel. 055 214 217