From Paris :

A6a then A6b following Nantes, Bordeaux.
Rejoin the A10 following Orléans, Nantes, Bordeaux
After 127km from Paris near Orleans, rejoin A71 following Vierzon,Chateauroux, Toulouse.
Near Vierzon, rejoin A20 following Chateauroux, Toulouse
At km 499, exit at the junction 54 and continue along N140 via Martel.
Carry on the N140 until Reveillon (near Rocamadour).
In Reveillon, turn left on the D673 and pass by Alvignac and Padirac. Just after Padirac (1km), turn right on the D60
Just before the hamlet called "Le Ventoulou" follow the sign La Grèze (a small road on the left). Continue along the road on 800m and you have arrived.

From Toulouse :

A62 then A20 following Montauban, Cahors, Brive, Paris
On the A20, exit at the junction 56 following Aurillac, Sarlat, Figeac, Saint Céré, Gramat.
At the roundabout, take the 2nd exit and continue along D2 / D802 towards Figeac
At the roundabout, take the 3rd exit and continue along D807 towards Gramat.
Pass Gramat and continue along D807. 4 km after Lavergne, turn left on the D60 towards Le Ventoulou. Pass Le Ventoulou and follow the sign La Grèze (a small road on the right). Continue along the road on 800m and you have arrived.