Instruct: Classify an Amazon review into positive or negative sentiment.
Query: The Insiders' Guide to Denver--4th Edition

This guidebook was a disappointment. The index is poorly constructed making it useless for cross-referencing. For example. under the section for the Denver Botanic Gardens it lists it as a "CC trolley stop," which is not listed in the index and which I could never find a reference for in the guidebook. Several of the restaurants listed in the book have gone out of business and one that we tried to find hadn't been in business for several years. When I visited a large bookstore in Denver, a display table with many recommended guidebooks to the area did not include this one. By the end of my trip, I had stopped using it.