I rented from Sixt 5 years ago, and I was happy enough to rent again.
But this time I found a friendlier, smiling, more patient staff that seem to understand that not all drivers are adventurous 30 year-olds.
Some of us are adventurous, slower, and a bit nervous 60 years-old : )
Patience while explaining all was key to our satisfaction!
And we loved the free up-grade!
I will definitely rent with you again!