We used this app constantly in Rome (and Barcelona). The detailed offline maps and site information was very helpful.
It did not seem to have all of the restaurants or activities loaded, not sure if they promote some above others based on fees... Regardless, the maps were invaluable because they allowed us to set pins and loosely plan our day in advance.
Also liked the Wikipedia entries, they provided additional context.
If they could add bus routes (and times) it would be 6+ stars!
Would not travel without this on the phone.
Becky Martin about TicketLens: Tours & Activities, v6.4