I used this app every dat during my 10 day trip to Rome.
Most useful- offline map. We navigated everywhere with this app. Mostly walking. It even shows stairs and shortcuts which are very useful in Rome with all of the back alley establishments.
Helpful- articles on hot spots and tourist attractions. The links to outside web pages werent working for me but it gave a good start.
BuddhaChick about TicketLens: Tours & Activities, v8.3.1