While rental been made with Sixt, car was provided by East Coast Car Rental. Pick up at airport by their shuttle has been fast & convenient, but you need to call for it upon arrival. Beware to their somewhat reduced business hours to make sure it suits your needs and flight schedule. Wait was minimal at counter since we were the only customers then. Car was clean & in perfect mechanical condition. Rates were much lower than with Avis or similar, so it was a good deal considering price/quality.
From information gathered on Sixt website, we were expecting newer car as they mention theirs to be like 3-6 months old on average. Ours was more like 3-4 years old and 98K. Nevertheless its been in perfect mechanical condition, so despite that point, I don't hesitate to recommend.