Low to no maintenance - hub gears are usually lower maintenance than derailer equipped bikes.
Slick, cool looking bike that will turn heads - you're talking about a Downtube Mini here. There is a monster thread here on that bike. The Dahon Curve also fits right into that desciption. I have some doubt on both counts whether they'll be good for 6'.
Bingo! +1
I'm 6' tall and ride a Mini. It's the favorite of my 5 folders. For your application, it sounds perfect.