Most car rental companies in Vienna require a credit card for renting a car. This is to ensure payment and provide a security deposit. However, some companies may accept debit cards or cash deposits instead. It is recommended to check with the specific company for their payment requirements.

To rent a car in Vienna, you will typically need the following documents:
- A valid driver's license issued in your country of residence
- A passport or ID card
- A credit card in the name of the main driver for payment and deposit purposes
- Some companies may also require an International Driving Permit (IDP) in addition to your regular driver's license. It is best to check with the rental company beforehand.

Basic insurance coverage is usually included when you rent a car in Vienna. This typically covers third-party liability and damage to the rental vehicle. However, there may be additional insurance options available for purchase, such as collision damage waiver (CDW) or theft protection. It is recommended to review the insurance coverage offered by the rental company and consider additional coverage if desired.

Yes, you can usually rent a car in Vienna and drive it to other countries. However, there may be restrictions or additional fees depending on the rental company and the countries you plan to visit. It is important to inform the rental company about your travel plans and ask for any necessary permissions or additional coverage.

The fuel policy can vary among car rental companies in Vienna. The most common policies include:
- Full to Full: You receive the car with a full tank of fuel and are required to return it with a full tank.
- Full to Empty: You receive the car with a full tank of fuel and are not required to refill it before returning. However, you will be charged for the full tank of fuel at a higher rate.
- Pre-Purchase: You pay for a full tank of fuel upfront and can return the car empty. Any unused fuel will not be refunded. It is recommended to check the fuel policy of the rental company before making a reservation.

The cancellation policies can vary among car rental companies in Vienna. It is recommended to check the terms and conditions of the specific company you plan to rent from. In general, there may be no cancellation fee if the reservation is canceled within a certain time frame (e.g. 48 hours before pick-up), but a fee may be applied for late cancellations or no-shows. It is important to read and understand the cancellation policy before making a reservation.

There may be additional fees or charges when renting a car in Vienna. Some common examples include:
- Airport surcharge: An additional fee for picking up or returning the car at the airport
- One-way rental fee: If you pick up the car in Vienna and return it to a different location, you may be charged a one-way fee.
- Additional driver fee: If you plan to have multiple drivers, there may be a fee for adding extra drivers to the rental agreement.
- Young driver fee: If you are under the age of 25, you may be required to pay a young driver fee.
- GPS or child seat rental: If you need additional equipment, such as a GPS or child seat, there may be rental fees for these items. It is recommended to check with the rental company for any additional fees or charges.