It was just scam.
Pros: At the beginning the lady was not aware of the booking. Then she found the booking. Bu she told me that there is no insurance for rental period. And after a little argument I had to add an insurance for full coverage. The rent was around 180Euro but the insurance for 4 days was around 370 Euro. Which makes totally 550 Euro. Also some more for the guarantee and totally I made 800 euros.... I hated this....
Cons: The whole pricing... Awareness...
Fast service at airport drop-off.
Pros: Very quick drop-off process at the airport.
Pros: long walk from where the car was rented to where it was parked in the garage, exp when 2 of us pulling 3 suitcases
Cons: somewhat difficult locating exactly where the rental was at the Cologne/Bonn airport when we dropped off my German relatives.