So the different keys mean the following: (as far as i could tell)
Enter = Re-Generate a completely new house with current settings
F (Full-screen) = Enable/Disable full-screen mode
Space = Re-generate the rooms with current settings
C (Colour)* = Change the background colour of the image
Shift+C* = Bring the default colour back
V = Toggle the darker edge of the bigger image
M (Moon) = Toggle the moon
A* = Toggle shadow drop in the rooms of the house
T* = Toggle small details in the corners of the rooms
G* (Ghost) = Toggle if there are or aren't any ghosts
* = Pressing this key will regenerate the room layout (the same as pressing space, but with the new setting)
Note, some keys i was able to figure out what the key (probably) stood for and wrote it in brackets. Comment with good suggestions