First time booking with SIXT. Helga handled both the pick up and drop off and was friendly and helpful.
I arrived around an hour earlier than expected and the car that I had booked had not yet been returned. However, another vehicle was located for me promptly.
Return was straight forward with minimal wait time. When Helga asked if I needed dropping off at the airport (they provide a shuttle service), I told her that I was going to the train station and she offered to take me there instead.
Very good service and would happily use again.