Cheap Car Rentals in Donaustadt, Vienna

I don't understand 2 things: 1. Why don't they write somewhere in confirmation, that they accept only credit card (no debit). Yes, you can find it on page 8/12 with font size 8 in general terms... And oh, they would accept debit if you pay double the price for insurance. Very disappointing. 2. You need to sing, that car has no damage and only then pick-up a car. Then you need to find a guy in garage to write down the damage, which was our case... very disappointing. Other than that, staff was nice and was trying to help.