Any ballroom dance pedagogy is going to benefit from a structured lesson plan, and usually the package plans from studios such as Arthur Murray or Fred Astaire will have a more disciplined approach to helping you learn rumba.
There are a few national chains such as Arthur Murray Dance Studios and Fred Astaire Dance Studios that offer free "introductory lessons" or group rates that can make learning ballroom a fantastic social occasion.
Teaching Method - There are many different styles of teaching, ranging from lesson-to-lesson by independent studios to complete studio packages from companies such as Fred Astaire Franchised Dance Studios.
You can watch fun and carefree dances such as Fast Swing Dancing by LindyHop411, or experience an old classic like Swing Time featuring Ginger Rogers and Fred Astaire.
Any movie that featured Ginger Rogers and Fred Astaire or Greta Garbo was sure to include an apartment decorated in the Art Deco style.