I havent gotten my Own stash yet but the perfect spot I could use for at alot if the False Back part of my Dresser Drawers, I simply pull the Drawer Completely out to the floor and have them faced flat against the inside, then slide the Drawer back in and they are good as hidden. ^^
2nd Hiding Spot:
I have many luggage bags stuffed up in my closet and I mean ALOT, which is why I can have some padding hidden in most and bury the bag they are in deep under the pile of junk I got in there!
3rd Hiding Spot:
Not under the Mattress, but the Very Hard mattress under it , meaning a false bottom under the bed. it has sort of a webby covering but I got a slight hole in there just for easy storage.
Whats your method of hiding your stash? :P