During the time you rent the car, you are responsible for all that happens to the car. The best way to ensure that there would be no undue claim for the damages later on is to make proper pictures of the car before and after the rental period. If the car will be still damaged (etc.) during the rental period, you have to agree on the reimbursement of damage with the car owner. If you do not reach an agreement, please write to info@autolevi.com