My husband recently spent 9 weeks visiting Paris, Berlin, Dresden and Leipzig.
We spent one month in Paris and split the remainder of the time in the other cities. We rented apartment in all cities.
Despite some of the posts we have read, we had no problems using our Chip and Signature credit cards in all cities. The only place the card would not work was in ticket machines at the train stations. There were a few small businesses that insisted on cash but that was not the norm.
We hope this information helps other travelers.