I also wanted to say that adjectives following the noun are definitely acceptable, but they have different connotations.
At a first level, saying "ένα βιβλίο καλό" emphasizes "καλό", either as new information, or as the important part of the sentence. And at a second level, it creates the expectation that more descriptions will follow, eg "ένα βιβλίο καλό και φτηνό" is what my brain auto-completes. "ένα Χ καλό και φτηνό" is a common co-location of adjectives.
"If you like your clause structure, you can keep your clause structure"