Worst car rental service I've ever experienced!!! If I could give them a negative rating, I would. We arrived at Charlotte airport and went out to the curbside to await our shuttle to come. After waiting for 30mins, I called Sixt to ask where the shuttle was as I had seen other shuttles drive by MULTIPLE times, yet no Sixt shuttle. The lady on the other end assured me that the shuttle was on its way as she claimed she spoke with the driver who said he was \"wrapping around the airport and would be right there.\" Well, another 10 minutes later, I called again wondering if the driver had gotten lost, disoriented, in a car accident, or blatantly lied, and again I was reassured the shuttle was on its way and that it should be there any second since their location was literally 5 minutes away from the airport (not sure why it would take so long to get to the airport when you're only 5 minutes away.)\n\nLong story short (kinda), the shuttle FINALLY appeared after 5 phone calls and waiting for over an hour in the freezing cold (this is when there was the huge snow/winter storm). The driver pulls up in an unmarked van (no Sixt logo), and proceeds to just sit in the car, not saying he's with Sixt, not saying anything... Just hanging out in the car, when at this point, there were 4 of us waiting for this \"shuttle\". One of the gentleman that was waiting with us went up to the van and asked the driver if this was indeed the Sixt shuttle, to which the driver responded yes. We got in the van and literally a 5 minute ride later, we were at the office. Mind you, there were no signs with the name, no logo, nothing. We literally got out in a parking lot that looked almost deserted, other than cars parked there. We entered into a small building and lo-and-behold FINALLY saw a Sixt logo. \n\nThe lady at the front desk was really nice and said she was going to upgrade us since we had to wait so long for the shuttle to come pick us up, which was definitely nice. The car, however, wasn't THAT great. I mean the car itself was a brand new Nissan Ultima so I couldn't really complain much about that... but the smell in the car?! Someone definitely was smoking like a chimney in there -- the smoke smell was so incredibly strong I had to drive with the windows down and the heat blasting so I could at least stand being in the car. Not to mention I opened the arm rest compartment to plug my phone in to charge, and a huge cloud of weed odor came out, so it was back to windows being opened. \n\nI think it's safe to say that I will NEVER EVER book another rental vehicle with Sixt, nor will I ever recommend them to anyone. I guess that's why they're \"Sixt\" -- because they suck!!!