I read it in translation. There are many factual and grammar errors. It is interesting, sometimes funny, but also sometimes disrespectful. I couldn't love it, but also couldn't put it down.
This book is not to be taken as a serious read about history – if you want that, pick up a different book. But if you want to learn about all the true (or perhaps not so true) scandals of European courts and are willing to give some slack to the writing and inaccuracy, The Alarming History of European Royalty might be an interesting read.
Read full review on my blog, Beyond Strange New Words.