Just that simple, no funny business.
NowPlaying integrates itself into the menu bar, taking no desktop space, no dock icons.
All options are available through a simple menu.
Small screen MacBook owners:
If you still experiencing sudden disappearing of the app, try pause or quit iTunes, the app will shrink to a single icon, you can then disable options such as artwork/artist/duration to further save menu bar spaces.
I recommend you to reach me via the support website or email for support, instead of using the review system as a support board, because: