We used Chappelle for a few years. It's kinda OK if you have a motorhome, as we did - but a couple of points to consider.
Most of it is not level ground, so you might find you roll out of your tent on some of the more precipitous ground.
It's f**k*ng loud! Being so close to the track, it's very noisy.
It's a main thoro'fare for folks trekking from Garage Vert, Houx and Houx Annexe, many of whom stop for a convenient piss in and amongst all your gear - so don't set up camp anywhere near the Dunlop bridge and the foot bridge over the Bugatti circuit.
There are stand pipes and (unpleasant) bogs. I don't remember any showers and deffo no electrical hook-up.
Upside is that it is super-convenient for a stumble to track-side.
Entrance is right next to Garage Vert entrance.