Mansion house is a perfect place for the aristocratic style of living, a lot of rooms and no neighbours. The first to do after moving to the new place is of course getting yourself a nice furniture. The house has so many rooms - it is easy to get lost there and my guess, it is ideal for making some kind of haunted house, adventure map.
Credits: Dan Lags
How to install maps:
Download .mcworld file below
Open file using any file manager to import it into Minecraft PE
Open Minecraft Pocket Edition and look for the map among your worlds