from Florence airport, take a taxi (€ 15/20) from Pisa Airport you arrive at Firenze Santa Maria Novella train station, by bus or train. Best station take a taxi (10/15 euro). If your bags are within 15 minutes walk.

from airport of Florence, it is better to take a taxi (15/20 EUR) From Pisa airport you easy arrive at the station of Santa Maria Novella, by bus or train. From the train station is better to take a taxi (10/15 EUR). If you have few luggage, walking is 15 minutes.