Belgrade Airport branch. Arrived an hour late for an 8 AM pickup, but it wasn't an issue. The overall process was smooth. They offered me an upgrade from Polo to Golf twice for an additional fee. I politely declined, and they ended up offering a free upgrade, which I gladly accepted. When returning the car at 9 PM, the return window was closed, but there were staff available in the Europcar area of the parking lot to assist.

Patience

No forced insurance sales from the rental company.

1. They ignore you if you don't speak English, even with a reservation. 2. They forcefully upsell insurance, not allowing you to see the contract until you sign and pay, which they use to justify the insurance push.

The car was inspected upon return with no issues, but later charges were made for damages, which is unacceptable.