Answer:
What kind of room has no windows or doors?
It is the great nemesis of the lactose intolerant.
All about the house, with his lady he dances, yet he always works, and never romances.
A word I know, six letters it contains. Subtract just one and twelve remains.
I am seen in the water. If seen in the sky, I am in the rainbow, a jay's feather, and lapis lazuli.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?