We stayed in the Royal Suite on Zenith three times...prior to RCI buying Celebrity. The suite is very comfortable but without a balcony which is a huge drawback to me.
The bedroom is separate from the Main sitting/living room. There is a tv in each room and leather couches. King size bed and dressing table area (but no extra sink). Good closet space. Bathroom was nice but not fabulous.
A glass dining table large enough to seat six USED to be set beautifully with linen clothes and napkins, flowers etc by the Butler for room service breakfast ...dinner etc. Of course, there are no longer butlers.
At the time Zenith was built, this was designed as a very comfotable, elegant suite but the new builds have many more features in their suites than this older ship.
Zenith is getting to the point of being considered "a little older".