The room is 30' square, centered on the door. It is a cramped bed room and work space. There is a small casket near the bed, and a some spell books, but not much else of any particular value.
Aldbane examines the casket, if he doesn't see anything out of the ordinary, he'll open it.
If he can manage it in time, Aldbane will uncork a flask of oil and spray it at the doorway area as the door opens, hoping the oil will cling to and give a hint of anyone who might be invisible.