No special access issues
You can park at the corner of D152 (Route d'Orléans) and Route d'Occident. The spot begins at the top of Route de vénus but you can also get to the rest of the spot by Route de Cupidon 500m further on the left.
The spot is also accessible by foot, from the train station take bus Ligne 1 to "Château" and then walk through the city until you get to the Obelisque and use the path Route de la Croix Saint-Jacques. It will take you 30/35 minutes.