We used this app during our last trip in Vienna, and the least we can say is that this app is really solid!
Ok, the UX-process is not exactly easy to understand but once you get it, the app is really great to help you organize your travel.
Just to help new users:
-To use this app the best way possible, you have to prepare your visiting wish-list BEFORE you go, as the app is basically a interactive map you save interesting things you would like to visit.
Preferably don't start using it when you are already in Vienna, the experience is better when you planed your visit on the app in the first place.
May be devs should do a small tutorial, that would surely help for the first minutes of use. UX, once again...
This app helped us to have a great travel in Vienna, so once one forgets about the first 1-2mn, I would highly recommend it!