Common Sense was WAY too hard on this
First off, this is a stellar movie and the best foreign language film I've ever seen. Now that that's out of the way, Common Sense, in a fashion very similar but less justified to what they did for Romeo + Juliet, rated the age WAY too high. The only reason I could think of to justify that a mature 13 year old couldn't watch this is that they wouldn't be interested (which is true, especially considering this is a French movie). There's ONE scene of violence. You've given movies with several scenes of violence 3 dots. And honestly, while the female lead is shown bathing, nothing is shown. You were way too hard on this movie, CSM. WAY too hard.
What other families should know
Too much violence
Too much sex