I have a soft spot for Heinlein. Often I think that a Heinlein book that I really enjoy will not be for everyone, however, in this case, I think nearly everyone would enjoy this light, entertaining romp of a book.
The narrative is from the POV of the protagonist Lawrence Smythe (hack actor "The Great Lorenzo"). Smythe is a narcissistic, self delusional asshat who is suddenly, more or less without his informed consent, thrust into what turns out to be the life changing role of a lifetime. It is fun to see Smythe's interaction with the strange world Heinlein built, and the development of Smythe's character throughout.
This was one of my favorite Heinlein books yet and I would recommend it to anyone who wants to read a good story that doesn't take itself to seriously.