small door in house?Follow

just got a 5 room house in SFP and in the room up stairs is a small door with a room on other side...what is this?

It's an inaccessible, extra area of the house that used to be for a quest when that house model was used for an instance. You cannot get into it. You can, however, place furniture in it. The best use for that room is to place stuff that you want for the status reduction, but is too lagre/unwieldy/ugly or what have you that doesn't match your decorating tastes.