Suggestions? Where in France is a good place to go for an exchange?

8 asked: The south seems like it might be interesting. I have looked up Aix-en-Provence, Montpellier, Grenoble and I know people in Nice. In the southwest there’s Perpignan, Toulouse, or Bordeaux. The cities near Belgium and Germany seem interesting also. I’m just throwing ideas out there.
Do you have any suggestions? [...]