The price at the counter was different from the price online. Not sure why. It's unreliable, no additional services, just a price difference.

I was two and a half hours late to pick up the car and was told the vehicle was no longer available. Communication with customer service was unhelpful (they said it was my fault for not reading the rental terms). I had to negotiate with the car rental company myself, and they finally resolved it (originally rented at Terminal 2, but they contacted Terminal 1 where a car was available).

The reserved car model was unavailable, so they gave us a similar Hyundai i40 wagon, which was very new.

They still charged me over 60 euros for the additional driver fee

The rental company made a mistake with the terminal. I booked a Passat, but they gave me a Peugeot 3008 instead. It seems the Peugeot 3008 is cheaper. Fortunately, the car comes with a navigation system, which is quite convenient.