Dungeon floors are quite small, and the first 8 floors are mostly hallways, with very small rooms which shouldn't take too many steps to map out if you wish. The floors with actual big rooms are the ones where you actually lack visibility.
The only exception would be Floor 13, but I do not think I will be adding a feature only for a couple of floors (At the very least, not now since a lot of more important stuff takes priority)... You can roleplay it with monsters on the middle floors making it harder to map out the floor or something
As for Lulune, it was not really a tease... It was a way to help new players, while showing a side event which I believe fits her (Using her "break" to make some easy money from newbies, and she also uses that spot for secret meetings, as shown in the story later on).