I would have appreciated some documentation upon the car's return that the car was indeed returned in good condition.

The company requested to buy an extra insurance in order to avoid paying nearly 2500€ of deposit

The clerk at the counter insisted that we needed to purchase insurance even though I was pretty sure I already had. After picking up our car and heading to our destination I looked back through my e-mails and have an e-mail that states "avoid buying additional insurance at the counter" with a receive and proof of insurance. Upon returning the car, and bringing this, and the e-mail, to their attention they told me too bad and they would not refund me my 250+ USD. The car was great, customer service was horrible.

Car was quite old, lots of milege. Car computer gave lots of warnings, which made driving unconfortable. Upon the return of the vehicle the staff told that we should not have paid any attention to the warnings. I wish they had told that to us earlier! The outlooks of the car were ok with terribly rusty wheels.

Too much time waiting for the driver to pick up at the airport. Vehicle in discreet conditions