Approach Guides

I like to do some in depth reading of the major places I plan to visit before my trips. In November I'm going to Andalusia and I see guides of the Mezquita and Alhambra by "Approach Guides". They seem more current than other attraction specific guides and are available on Kindle. I don't see one on Sevilla's Alcazar. Has anyone on this forum used any of the Approach Guides for any location? They seem have some for other countries as well. I'm looking for a little more detail than RS or Eyewitness Travel provides, and since I'm very visual, photos, floor plans, diagrams help. Thanks!