From Florence: take the superstrada Firenze-Siena, exit at Monteriggioni take direction to Siena.
When you get to the sign Poggiolo turn left; you'll arrive after about 200m

From Rome: take the superstrada Siena-Firenze, exit at Monteriggioni take direction to Siena.
When you get to the sign Poggiolo turn left; you'll arrive after about 200m