The rewritten Style Guide has an open discussion of the spoiler policy. The current policy will be used if no new consensus is reached. Discuss it here.
to enable the maid you have to have the 'sink to the bottom of the water' wallpaper, #107, which you get from an event on the Ocean Floor.
in the construction frame building she appears on the 2nd floor, in the room on the left at the base of the staircase.
and on the subway platform she appears exactly where she's shown in the gallery :P