How do you know when your Sims are 'settled' in a home?

The home has to have a dash of flavor, not just any flavor, a flavor provided by your Sims. For example, do not have something in your home a Sim would never use due to their traits and back-story. Adding clutter that goes with the personality you want to establish will also help. Lighting is key as it gives it a sense of warmth, atleast for me. I sometimes imagine myself living in said house and if I can let out a nice sigh of "Yes this is home", I know I've done my job.