Looks good

I will not continue on this topic. Not sufficient time, sorry! The more i appreciate your work on this!
Some feedback in case you want it. If not, don't read it

hard failures:
* a secret door across a hallway (doors across hallways - ok. Secret doors across hallways - nok)
* A door ending in a blocked field
* A door in the middle of a room
Suggestions:
* A room filled to more than 50%; the small 3x2 Room. That's of course possible, but i would consider that a style error, except exceptions
* No entry nor exit (maybe that one door at the blocked square was intended as entry?)
* Tree structure labyrinth with lots of branches (again, this is possible but shall be considered part of the story; e.g. as option tickbox or such. Options could be: Loops or not? Main way with Branches, and how many? "Bush" labyrinth without main way?)
* No furniture, double doors or other more-than-one-field stuff (i guess that is on the worklist?)