Got upgraded to a larger car without additional charges.

Very good, they do not cause unnecessary trouble. If you don't want to upgrade the car model or buy insurance from the store, just refuse.

Picking up and returning the car took around 5-10 minutes. The service attitude was good, and communication in English was possible.

Excellent staff. Lots of people waiting for the car and thus we had to wait a little ~30mins) . Would rent from them again.

It just feels like a very dishonest company. There is basically no way to really know how much the rental will cost beforehand. Even when one book from full to empty, we have to fill up to avoid fees. I am not even mentioning the insurance scam here. No use for prebooking insurance. You will have to take the Ok rent a car insurance if you don't want your experience to be horrible. Will never do business with them again. On the day of return, no one was there. We had to call some non obvious number to have service and assure us that someone will come take care of us and bring us to the airport. In addition, it was not clear at all at the time of booking that the company was not directly at the airport but somewhere else.