I work for the Sixt head quarters in Berlin Germany, and honesty this is the worst company I have worked for in all my professional career.
They lied to you about conditions, promotions since the very begining ( I mean the interview) anything you want to hear to let you in (even if you are working for a different company)
Then once you are in... The fun begins, not serious schedulles, working long hours every weekend and late shift.
Even when you advice them the holidays within 3 months, with several reminders they tell you 2 weeks in advance you can't go. Really unprofesional in every single detail.
Also they don't tell you in the interview you will work though a temp agency and you will not get your payment until the 15 of the month after.