They forcibly refused to let me rent a car and canceled the order without consent.

They said the international driving permit was not acceptable and asked for the Chinese driving license. After getting that, they said I needed a translation. When I showed them the translation in my email, they said the international driving permit was fine. That was a very frustrating experience.

The weather was cold and rainy. We were asked to drag our luggage to the parking lot, but there was no car available there. We were told to wait for five minutes, but it took about twenty minutes. It was 0 degrees and raining, and after such a long wait, a car with a flat rear tire arrived. We found out and were told we had to wait another hour to change cars. It was too cold, so we dragged our luggage back to the airport to wait. The process was inefficient, and the pick-up staff were very rude with a heavy accent in English, and got impatient when asked to speak slower. We were the only ones renting a car that day, but it took a total of three hours to finally depart.

It's okay

The price didn't match what was advertised on the website. The site mentioned a charge of 4.8 euros per day for crossing the border. We only needed the car for two days in Montenegro but were told to pay a maximum charge of 48 euros for ten days (even though we were renting the car for only eight days). The reason given was that they couldn't know how many days we would be abroad, despite entry and exit records clearly showing this. It felt like an overcharge.