I was pressured to buy very expensive insurance that cost almost $600 for the 7-day rental period.

The car was brand new but the engine was noisy and seemed to have trouble shifting gears even though it was an automatic and I was always driving exactly the speed limit. I was pressured into buying $600 in insurance for the one-week rental because they said that if there was even a small nick in the paint from a rock I would owe tens of thousands of Euros. The woman at the sales desk wrote down some huge numbers of fines that I would be charged. I returned the car with 600 km of mileage and in perfect condition -- but I had been pressured to buy a ridiculous amount of insurance. I will not rent from them again.