Mr Kelly on reception was extremely friendly and efficient, including a free upgrade from a standard Golf-type vehicle - initially offered as a 'small car' Peugeot 2008, which I would have been disappointed to have had as I would class a Golf sized as medium - to a BMW 1-series M Sport (very nice!).
Car was clean, well equipped and very nice to drive. (And all the cars waiting in the car park looked to be fairly new, clean and good specification). There were some existing damages to the wheels and bumpers all noted, and the fuel tank was full.
On return the process was again quick and easy.
I was most pleasantly surprised that the holding deposit was refunded to my credit card within 24 hours and my invoice was issued through the app. Great service and I have booked another trip with Sixt in a few weeks time. It was a little bit more expensive than some other rental firms nearby, but hopefully it will be the same experience and worth slightly more! (*fingers crossed)