Used to fly in there quite regularly from St Cyr l'Ecole (near Versailles) for T&G's.
Great view of the cathedral while in the circuit, especially on 09!
There is a second glider strip just east of the airfield, so watch for that (with their own freq I seem to remember...).
Southern grass R/w is for gliders, northern concrete (quite narrow) is for powered.
Note, as often the case in France, there is a wider circuit for arrivals/deps & a much tighter "internal" one for T&G's.
Otherwise, just make your calls in whatever language (English or French) you think will be best understood (French pilots understand more English than they let on often...).