Pretty good.

Although the waiting time was nearly an hour, it was mostly due to incomplete preparation of documents and language barriers. Foreigners are very organized and punctual; they won't serve you before the appointed time. Also, their flexibility can't be assessed by domestic standards. Completing a single transaction generally takes about half an hour; mine took roughly 18 minutes. The lady who served me was very friendly.

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.

They clearly explain the precautions when picking up the car, including the return location and type of fuel. There's no push to sell insurance. However, when returning the car, you have to go inside to find someone to assist, unlike other companies that have dedicated personnel waiting in the parking lot. The lady inspecting the car was not very knowledgeable and almost mistook a load-bearing mark for a dent. But after communication, there was no problem. The deposit was refunded on the spot.