There was hardly anyone at the rental store when I arrived, so there was almost no waiting time.

Pretty good

Picking up the car was convenient, but we got a Nissan instead of the booked Mercedes. The Munich airport branch was hard to find; the GPS was not accurate. We nearly missed our flight while trying to get the correct coordinates with someone's help.

Not bad, the taxi driver knew the way. The store was easy to spot and also clean.

Like: The staff was so kind and we got the car so soon, with just 500 KM used (that is amazing).
Dislike: I reserved a Mercedes-Benz C-Class (Premium Class), when I went to the station they told me that car is not available, but they didn't give me other cars in the same class (the same class is BMW 328 or Audi A3 ...) I got an Alfa Romeo Giulia that was so good but that was not at the same class with my reserved car.