Out of all the popular cities in Germany, Münster is the cheapest city to rent a car in at just $15/day. Renting a car in Münster is 32% cheaper than renting one in Mannheim where the per day rate is around $22. Other fairly inexpensive cities in Germany to get a rental car in are: Berlin ($16/day), Leipzig ($19/day), and Bremen ($19/day). While these cities typically have cheaper prices than the rest of the country, travelers looking to rent a car in Berlin should expect to spend around $16/day on their transportation. The most popular city to rent a car in Germany is Berlin.