With GPS put Tonni as final destination.

From Florence
A1 exit FIRENZE CERTOSA
Superstrada to Siena
Exit Colle Val d'Elsa South
SS 541 direction Grosseto to the Km. 1,250

From Grosseto
SS 223 direction Siena
Turn left to Rosia at the village turn left onto SS73
At Montarrenti's turning, bear right
SS 541 direction Colle Val d'Elsa for Km 1,250

From Siena
SS73 direction Rosia and pass it
At Montarrenti's turning, bear right
SS541 direction Colle Val d'Elsa for Km 1,250

From Roma
A1 exit Val di Chiana
Superstrada direction Siena
Turn right left to Rosia at the village turn left onto SS73
At Montarrenti's turning, bear right
SS 541 direction Colle Val d'Elsa for Km 1,250