An efficient service (since my company has a contract with Sixt) however, I struggled a lot to find the office from Part Dieu station as there was no sign/indication + the entrance was well hidden behind temporary wall panels due to some roadworks, where, again, a small sign that was easy to miss was found with a long French text saying like "Your car is waiting for you here to take you anywhere....blah~blah~"Just their logo and an arrow could do much better job!