Have any of you rented a car from Budget at Amsterdam Airport? How was it? Are there any hidden fees ?

I didn't rent a car at the airport because it's difficult to find a parking space in Amsterdam city and the parking fees are heartbreaking. It usually costs 4-50 euros/24 hours. I rented a car in a downtown store in Amsterdam and then drove it to Brussels airport to return it. I rented from Avis, but Avis and Budget are actually the same company. I waited in line for almost an hour to pick up the car, although there are separate windows for Avis and Budget on the outside, in fact they are the same. Finally, I got the car through the Budget window. When I was processing, she asked me if I wanted to add comprehensive insurance. I said I had already bought it at the agency, and she didn't say anything else.