In order to provide yourself the best protection during your rental car period, you should always choose the insurance option "fully comprehensive without excess" and make sure that you have a high liability coverage. All car rental providers require a deposit. The amount varies among the car rental companies. If the rented car is returned without damage, the amount previously debited will be credited to your credit card or, alternatively, your deposit, which was paid in cash, will be refunded.You also have the option to arrange an additional driver to be included in the rental car. Usually an additional fee is charged for this. However, there are also offers that include an additional driver free of charge.