When using with MILES, you are covered by both third party liability and fully comprehensive insurance. The fully comprehensive insurance includes a deductible of 350,00€ for passenger vehicles (MILES S/M) and 450,00€ for LCVs. So if someone causes an accident and you are involved, but not at fault, you pay nothing.
If you have caused an accident, you must pay for the damage, but only up to a maximum amount of the respective deductible. As a rookie (driving license for less than 12 months), the deductible is €2.000.