If I am not mistaken, the app allows you to either choose your room or it gives you an option to have the hotel choose it. It now includes the hotel on a map so that you can orient the room choices to the surrounding area. I have not used it since that feature was added. How it decides which rooms are available for you to choose is something I don't quite understand. But I don't think it will let you choose ocean front (for example) if that is considered a higher room classification and you aren't eligible for upgrade.