From Chateauroux:

Take exit 7 of the A20 and follow the sign for Méreau at the first roundabout. At the second roundabout, follow the sign for Alnay and then take the first turn on the left to rue d’Autry You will see the château from here.

From Paris:

Take exit 7 of the A20 and follow the sign for Alnay at the first roundabout. Then take the first turn on the left to rue d’Autry and you have reached the château.