Apparently a thorough guide for the professional interior decorator, only a small proportion of this book was helpful to me as a private individual trying to figure out how to furnish and decorate a regular, middle-class flat. The book has lots to say about vast interiors and enormous budgets, but that is, unfortunately, not my circumstances.
What the book does have to say about principles (what do people like and dislike about a space, how should you think about colors and fabrics) was mostly helpful. However, I seem to disagree severely with the stylistic choices made by the designers heralded by the book: Many pictures of "good" interior design features decoration that is purely ornamental. I like pretty things, but I dislike things with no purpose.
Possibly, the rating is unfair: The book quite clearly states that it is what I discovered it to be.
PS. Yes, it is December 24th, and I spend a bunch of the evening reading a book about interior design. Thank you, Covid-19 and pre-emptive self-isolation policies.