Please don’t bring traveler’s cheque if you travel in France and especially in Reims.
Very few banks (even listed ones) will accept them.
We recently had a guest who had his cheques refused by 6 major banks in Reims (not remote branches but the main ones in the city)
In Paris some specialized currency change shop will accept them but will claim a fee.
At ‘Les Telliers’ B&B , we accept payments in cash, French cheques in Euro, ANCV holiday cheques.
We have no credit card terminal at home.