Jmolnar.net/BB6 is the first site to question the mysterious door on the second floor (hey, that rhymes!). Anyway, at the end of the balcony, in the tour videos and pictures, one sees an unexplained door. Could it be the Storage Room? Probably not, considering that items inside would have to be carried down the spiral staircase, which would be very difficult. (Also, there is another door by the Diary Hallway which could be the Storage Room door.) There has been mention of a secret bedroom, but who knows?