Not so free... To view/read most of the content, you'll need a "full version" at 5$. Navigation within the app is OK but not great, most of the content is copied from Tripadvisor. Wouldn't advise it to my friends.
Useful I found this guide really helpful, especially the free map with pins of attractions and listings.
✔ Fixed AZ Index crash on Android 5+
✔ Tourist information and content update
✔ Improved map functionality (with Points of Interest filter & directional compass)
✔ New restaurant listings
✔ Improved handling of different screen sizes and rotations
✔ New and improved user-friendly design
Travel guide with audio sightseeing tours for 900 cities around the world!
Official guide for Hamburg - 1,500 POIs, tours, audioguides, shipfinder and more
Beijing Shanghai Sanya Guangzhou Shenzhen Hangzhou Xian Chengdu Guilin Xiamen