I've done business on two separate occasions with Frank at Sixt Bariloche Centro. The first time was turning in a one-way rental from Mendoza. The second was for a round-trip from Bariloche to El Chalten. Frank speaks perfect English, got me in and out lightning fast, and most importantly gave me his contact info in case I needed anything during my three month stay in Bariloche. On my three week trip to El Chalten, Frank checked in with me twice by text to make sure everything was okay. This is my fourth time using Sixt worldwide and I'm a loyal customer now. But I have to say the service in Argentina from the Mendoza and now Bariloche offices has been by far the best.