Pretty good!

The front desk staff's English was very poor, making communication difficult

No upselling. The staff was polite. The car we originally booked had an accident the night before, so we had to wait for an hour for a replacement.

There seem to be a lot of locations

When picking up the car, they emphasized multiple times that it must be returned before 19:00. I rushed and managed to reach the return location, but despite the lights being on and the door seemingly open, the main gate was locked and no one was there to accept the car. I tried calling all provided numbers, including the one on the key, but all calls went unanswered with just a message asking me to wait. There was no way to contact Europcar's customer service, resulting in us being unable to reach our accommodation on time, causing a loss.