The Louvre’S Clandestine Apartments

We've looked at a few cloak-and-dagger apartments over the years, around links below.
From Messy Nessy Chic:

MUCH MORE The rooms are rattling French:

Previously: 
The Apartment Inside Grand Central Terminal
MUCH MORE The rooms are rattling French:

Previously: 
Radio City Music Hall's Secret Apartment

There are more, we'll drib dead to them.