Winter Garden is the only 1* spot I've been to in Florence, and we liked it a lot! Wine selection and great service particularly stood out for me.

Not a Michelin star, but if you're into wine, Osteria dell'Enoteca was one of my favorite meals in Florence. It's opened by a group of ppl who started a wine bar down the street, so needless to say the wine selection was fantastic. Instead of bringing you a wine menu, they take you into their cellar to choose a bottle. Definitely worth a visit if you have time.