From Florence airport take the shuttle bus to reach the central train station Santa Maria Novella. From Pisa airport take the train to Florence (last one at 22,30) or aTerravision bus to reach the central train station Santa Maria Novella. From the train station you walk for 15 minutes toward the Duomo, you'll be in Via Panzani. Walk straight down this road for a few blocks, mnow you are in via Cerretani, until you will find yourself in piazza del Duomo, facing the monuments. Walk straight past the Duomo, with the church on your left side, until you find via dell'Oriuolo number 17.