Stephanie and Riky are really kind and i can say more than the Diamond Service itself.
I really suggest to take car to this branch because they do their best to always have a statisfied customer.
Just be' carefull that from Ramstein Military base is not possible to get car if you are not American and Sixt do not show this on their app. Sixt, you must change this to don't let go there your customer without hav possibility to take the car.
Once again thanks to Stephanie and Riky :)