If your plans are up in the air, don’t stress. When you choose the “pay later” option you can cancel your booking at any time, for free.
Debit cards are accepted at some SIXT branches with 2 forms of government-issued ID. Check with the branch before booking for their payment policies. Major credit cards are accepted at all locations.
The minimum age to rent a car with SIXT is 21, and an underage driver fee will be charged to those under 25. Some larger and specialty car categories require drivers to be 25.