I made the mistake of putting 6 large baskets in the master bedroom in the Dawnstar Dark Brotherhood Sanctuary and filling them with soul gems. I left the sanctuary and came back a couple hours later to find all of the soul gems scattered around the room and the baskets nowhere to be found.
Also, be careful with the weapon rack in that bedroom. I filled it with named weapons and the Blade of Woe randomly disappeared never to be seen again.
Good guide btw. Very helpful if your new to decorating.