How to reach farmhouse near Siena "San Giorgio” driving directions

From Florence and Grosseto:
Exit at Siena Sud on the expressway, follow directions to Rome. At the traffic lights turn right and continue for 3,500 kms. Turn right at the street sign for RADI on a country road. Continue along the road for 1, 800 km and you will find S. Giorgio atop of a hill on the left.

From Rome:
Exit at Valdichiana on the A1 motorway, follow directions to Siena. At the roundabout turn left to Monteroni d’Arbia. Once on the Cassia continue for Monteroni and after 1,500 km turn right at the street sign for RADI on a country road. Continue along the road for 1, 800 km and you will find S. Giorgio atop of a hill on the left.

Google Earth:
43° 15' 33" N
11° 21' 43" E