I’m always thought that Rick Steves has the world’s best job of traveling through Europe and giving viewers tips on what do do and what to see. In fact, the last trip I made to Rome, we used his travel book quite a lot that helped cram a lot of sights into a single day.
Right now, his 2014 Ebook Europe Through the Backdoor Kindle edition is on sale for only $1.99. It includes over 800 pages of good information for trips to Europe. I highly recommend spending the $2 for a very good reference book.