If Courtyard full, try Dorint, Roissy close by, as plan B.
If stuck at Kyriad, Novotel, LBG don't walk around there at night. I know a crew of 3 who were mugged at knife point by a N African gang (admittedly around '94 but might still be dodgy). They seem to think pilots have cash on them. They haven't come accross the tight one's that I fly with! Get a taxi.