Thanks for the replies.
My reservation is using an old-school GLON, but I may have a shorter stay there some other time, instead:
1.) It's still a cat. 3, so assuming there are ever point stretchers...
2.) I'd rather split my trip evenly w/ Berlin or Vienna, rather than 6 nights in prague and 1/2 in the other city
3.) I get bored of hotels after a few days!
My only trip to Prague was one night a few weeks after the floods, so I've seen the Hilton from a distance. Look forward to seeing it up close.
Thanks again.