I just stumbled on a mentionable ressource of high quality 3d models for architectural interior visualizations. You can find at designconnected.com several really nice looking models like sofas, chairs, desks and so on. You can add them to your cart for the attractive price of 0 Euro.
It is also interesting because you mostly can choose between different CAD formats like Autodesk 3DS MAX, Sketchup, OBJ. You will find the 3d models here: