I purchased this book to read before setting off on a trip down the Danube later this year. It is an excellent guide to the history and character of the places along the Danube, written in an easy to read style and with just the right amount of detail for my tastes. I would certainly recommend it to others requiring a readable guide to the Danube.
I only give it 4 stars however because of the illustrations. There are plenty of photographs spread throughout the text. However, with hardly any exceptions they have no captions, so one is left having to guess what they depict (usually an informed guess can be made by reading the adjacent paragraphs). Also they are all in black and white and printed on non-glossy paper, so their quality is not great. The book does contain a number of clear and helpful maps however.
I only wish there was a similar book about the Rhine and Main.