I know it's a wall glitch, and dang hard to describe...
The stone wall in the left side of your pic is the way to get up there, but you need to be on the other side of the wall, the side from the hill leading up to the town entrance. Once on top of the wall, you should be able to "slide" thru to the balcony (like sliding behind the bar of a tavern). I've done it once, and was helped by someone pushing me.
Sorry if that's no real help.
Anyone else that has a better explanation, please, share
