They didn't recommend insurance, saying the one I bought was sufficient. Don't worry too much about being upsold; just tell them you've already purchased insurance. Communication in English is manageable.

They did not provide the Mercedes I booked, instead they gave me a Passat, claiming it's of the same class.

When booking the car, it was stated that the cost would be 1316, but we were actually charged 1847. The rental company added a lot of additional insurance without informing us and charged our credit card before showing us the contract for signing. The entire contract was in Turkish, which we couldn't understand. We thought we had purchased full coverage insurance, so we signed it. Now, they refuse to refund us, claiming we lack evidence and that our signature means we accepted the charges. How could anyone know they were being scammed and record everything on the spot for evidence? This is consumer deception and forced charges!

The service attitude was perfunctory, and they didn't inform us of the return route in advance. The return location was extremely hard to find. We spent an hour looking for it and almost missed our flight.

Got an upgrade to an SUV which was very welcome.