There is 2 usage of domodroid depending what domogik version you are using.
In case you’re using domogik 0.2 the Main screen is organize by Room.
In domogik 0.3 (and later) Room are now include in Domoweb UI no more in Domogik the Main screen is organize by usage/device.
In both case the map view is the same.
If device description is not empty it will replace the device name displayed
Longclick on a layout (area,room,widget) open a menu that allow you to rename, change icon or remove the selected item.