Which room in Gatsby's house is the simplest?

Many people consider Gatsby's bedroom is the simplest of all rooms in his house. His room is away from the spectacle he has built around him. In his room, Gatsby can be himself, instead of the illusion he created when he steps outside.

"Sometimes, too, he stared around at his possessions in a dazed way, as though in her actual and astounding presence none of it was any longer real. Once he nearly toppled down a flight of stairs. His bedroom was the simplest room of all." (pg 91)