We rented with Europcar and used our Amex for the coverage. Just the basic - I didn't know about the premium coverage offered by Amex but would def use that next time.
The hold put on our card was 1200 euro.
We did end up getting scratches on the car in a parking garage, and I am having issues. The big thing is I rented via AutoEurope. I need an invoice showing how much the damages were to send to Amex (there is a charge on our Amex of course, but it included the final drop off fees and doesn't break down the final fees and the damage charges - we know how much they charged, but we need a separate invoice showing those charges) - and I have sent at least 3-4 emails to Europcar - the only response I got on the first one was we will forward your request to AutoEurope and no responses at all to my other emails (not sure how they can help me with the damage charges?). So it is ongoing.
But my biggest lesson (and Amex is working with me here but not sure what will happen)...make sure you use the card of the person who will be the primary driver. I used my card even tho it was my husband doing the driving - I generally do since I do all the booking of airline tickets and accoms when we travel. Even tho we are on the same account (cards have diff numbers of course), the lady on the phone (who tried her best to be helpful) told me that the card used needs to be the card of the primary driver. We did use his card for the hold on pickup and for the drop off fees, so that may be working to our advantage.
We had no issue declining the insurance offered by Europcar - no upselling or anything. We rented at the Avignon TGV and dropped in Nice.
I'm sure hubby just showed his driver's license. He didn't get an IDP - it isn't a hard and fast requirement if you are from Canada (according to the government of Canada website one is 'recommended'). My DL is already in English and French, so perhaps that is why...