Look for the birds
It's true that we're out in the country, a bit off the beaten track.You won't find any road signs pointing to our village.
To keep the property as private and calm as possible, there isn't even a sign on our main gate.
So when you get to Jonvilliers, slow down and look for the two brick gateposts that sit on either side of a driveway heading into the woods. On the lefthand gatepost there's this sign:

When you see the two pheasants, you'll know you're in the right place.
GPS Coordinates
N 48.561125
E: 1.702352
I can't recommend driving with a GPS navigation system enough. It makes French roads much less intimidating. And you can usually get one in your rental car for a nominal fee (make sure to ask for instructions before leaving the car rental parking lot).
Click on the following links to obtain driving directions from Google Maps. Select where you're coming from (or going to):
In the past we've always recommended the ViaMichelin mapping service. It is still very good, but we've gone with Google Maps because their directions and maps are as good as ViaMichelin's and because they provide more free tools to small businesses like ours.
Old fashioned help
Even with Google Maps and GPS, sometimes nothing beats an old fashioned road altas. Michelin is the best.