Flawed. Useless. Booked in the app, communicated with property manager in the app, used the map in the app while staying. On the last day of our stay (check out day), it will not allow me into the stay details, nor the messaging feature, which precluded me from seeing the lockbox code which I needed to put the key in to check out. Tried mobile data, wifi, everything. No security or permission issues on my phone. It's your app and you set me back 45 minutes in my travel day.