Good travel guides/books for Europe covering Czech Republic, Italy, Netherlands and Spain

Rick Steves.

Rough Guide.

Lonely Planet.

Rick Steves, Rough Guide, Lonely Planet.

Check if they mention places like Bohemian Switzerland, the Spa Triangle, or Bohemian Paradise. If not they aren't good travel guides.

But be sure to check the publishing dates of the guidebooks. I typically buy a RS guidebook (most are updated annually) and usually a Lonely Planet guidebook for our destination(s); however, if the latter is a few years old (they update about every 2-3 years), I will buy something else that is more current. I like the RS guidebook for how to get from point A to point B, the guided walks, and the maps of the sites, and prefer Lonely Planet for restaurant listings and things not covered in the RS guidebooks. Lonely Planet guides are also available electronically as an entire eBook or you can purchase individual pdfs of chapters within the book.