Rented during the off-season, no waiting required, completed the formalities and picked up the car immediately. The car was not the model I reserved and was slightly smaller than expected. When returning the car, there was no staff in the office area, had to call someone to come and complete the return.

Overall satisfied.

The Zakynthos airport is likely building various rental kiosks. They wait with signs at the airport exit, which is convenient. Their current store is just to the left of the airport exit with a clearly marked sign. The process is convenient, although I'm slightly disappointed I couldn't choose the car myself. For mountain roads, a powerful car is better.