Title pun? Just how clever am I?
Anyhow - I'm back. The Sixt office I had in mind is indeed about a 1 mile walk, and I walked it. They were surprised to see me, as there is another Sixt office just around the corner from the Hilton. Dunno why I couldn't find it on their site. Oh well, got the car, had a great time.
Swore I'd never drive in Paris. I still think I made a good decision, but in order to get out of the city, I had to negotiate the circle around the Arch de Triumph: Man! What a zoo!