Picking up the car from the parking lot on the first floor was easy, but returning it was difficult! When returning the car, the GPS only guided us to the second-floor parking lot, and we couldn't navigate to the first-floor return point (which was also the pickup point). We ended up walking to the office on the first floor (accessible by stairs on foot, but not by car), even running to the airport counter seeking help, but were refused everywhere due to busyness. In particular, the people at the first-floor office, who were just a few steps away from our temporarily parked car on the second floor, refused to come over and guide us. Our flight was about to depart, so we had no choice but to leave it on the second floor. In the end, we were charged a 48 Euro parking fee...