Placed for MWGB.
Even if you have never played the classic CLUE game, you should be able to figure this one out if you are enough of a detective to gather the clues required!
You will need to go to the posted coords. Answer the questions from information you will gather there, insert them into the formula below, then off to the final coordinates that will lead you to the container you seek and a multi-cache smiley.
N41 35.ABC W084 09.XYZ
A - How many rooms are there? ____
B - In the Billiard Room there are two doors. How many individual door panels are there? ____
C - In the Library, there are 3 fireplaces. True = 4, False = 0 ____
X - In the Dining Room how many chairs are there? Now, subtract 4. ____
Y - In the Ballroom, how many pianos are there? ____
Z - How many secret passages are there? ____
Please remember to respect the game, play fair, bring your own writing utencil, be safe, CITO when needed, make new friends while cherishing the old, and always represent the geocaching community positively.

You can validate your puzzle solution with certitude.