The grand appartement du roi is the King's grand apartment of the Palace of Versailles.
As a result of Louis Le Vau's envelope of Louis XIII’s château, constructed as part of Louis XIV's second building campaign, the King and Queen had new apartments in the new addition, known at the time as the château neuf. The State Apartments, which are known respectively as the grand appartement du roi and the grand appartement de la reine, occupied the main or principal floor of the château neuf. Le Vau’s design for the state apartments closely followed Italian models of the day, as evidenced by the placement of the apartments on the next floor up from the ground level – the piano nobile – a convention the architect borrowed from 16th- and 17th-century Italian palace design.
Wikipedia https://en.wikipedia.org/wiki/Grand_appartement_du_roi
Address (Unnamed Road), 78000, France
Coordinates 48°48'18.351" N 2°7'15.262" E