Missing well... everything. Nah I'm just kidding. You only need a bed, table, and the nurse (wink, wink).
In the future, it's easier to open your inventory and hit the housing icon above your equipment, then click housing query, which will then tell you if the house is suitable and what it's missing if not by clicking your house. And, you'll also need 50 silver coins for the merchant to move in, if you don't have it already.
