Some guidebooks can be a little dry, with huge blocks of text and occasional inserts of photos,but DK Eye Witness Travel Guides are the opposite. As well as having the usual up to date info and recommendations, they are heavily illustrated with fabulous 3D style intricate street maps, with all landmarks and buildings drawn in. Its as if you are stepping into a model village with everything illustrated and where it should be (cathedrals, museums,parks etc). The illustrations and photos are in colour too, which makes it a joy to use. I don't know why other guidebooks look so dull in comparison. I recently bought a guidebook to California and it felt like wading through a dull encyclopaedia or textbook by comparison. If you're like me and you like maps, pictures and photos in abundance, rather than large unbroken blocks of text, then buy the Eye Witness Guides.
My friend is going to Lisbon next year and loved this.