A bit of advice when using Europcar, at least out of Charles De Gaulle outside Paris. Scrutinize your bill (agreement) carefully. First off, the reserved price, such as with autoeurope, might not be honored. Additional costs will likely show up. More importantly, there is a section above this part of the bill where additional, untotaled costs may reside. There is no "total" cost on the bill, so it is easy to miss these add-ons. Finally, before leaving, make sure, even if you have repeatedly said "no upgrade", that no upgrade has been slipped in.
Other than that, we had a great 3 months touring about.