A1 Firenze/Roma exit Valdarno:

Turn right to Montevarchi first and then Gaiole. Take road ( Strada Statale )
n. 408 direction Siena.
Travel throungh the village of Gaiole in Chianti.
After 5 Km make right following Lecchi sign.

From Siena:

follow ss408 to Montevarchi ( starting near the train station ) and after
19 Km ther will be Lecchi sign.

GPS:

N 43°26' 03.99"
E 11° 24' 04.45"