I love how simple this is, but i think the layout could be played around with more to fit more layouts. Or even the back of the page being for more layouts.
I thought about more varied shapes, but I wanted a left-to-right horizontal approach so that you could draw the dungeon across the top of a piece of paper and still have lots of room below for notes etc. I appreciate that the results are less interesting than if the dungeon e.g. turned back on itself.