No customer service at all, very indifferent attitude.

They canceled my reservation without prior notice, forcing me to rent a car for 240 EUR at the last minute

This rental company specifically scams Chinese customers. They pre-mark the wheel hub and then claim you damaged it when you return the car. How could it possibly get damaged there? German brains must be full of crap. They don't allow you to inspect the car when picking it up, and when returning it, they say everything is fine. Four months later, they deduct your money, truly shameless.

The store at the east entrance of Munich train station had my car ready when I arrived. They didn't mention any additional insurance, and I just filled out the information and picked up the car. The rental cost over 290 euros, and a deposit of 300 euros was taken.

Large company, many locations, lots of cars, counter service available.