Office easy to find right outside the main ferry terminal. Just one minute walk.
Dario (office staff) was very helpful, polite and quick.
I would use Sixt again when I’m here and highly recommend for travelers from USA
I reserved online and prepaid.
They took a small deposit for security / protection.
UPDATE: Return was just as easy. Fast efficient. 1) there’s a gas station right next to Sixt office. Easy fill up
2) if you drove to Montevideo, on the toll road (which I recommend as the road was great), you will pay your tolls at the Sixt desk at check in. Easy.
3) Our 7 seater SUV was excellent. Great condition. Clean. The Sixt cars seemed newer / cleaner / better than the other rental offices around
4) Return Agent at the desk was pleasant and respectful. Excellent English. Both at checkout and checkin