Comprehensive insurance is indeed included in your rental. We encourage you to review the insurance coverage details in section 5.8 of our website.
If the car incurs damages during your rental, you will be responsible for a deductible of €1,000. The details of this deductible are described in section 6.12 of our terms and conditions.
You can also find a chart with more information about damage costs at https://www.jool.co/damage.