For my occult save, they would definitely have that "old wood" smell from the house itself. Since it's a very sparsely-furnished, somewhat haphazardly decorated place, I would expect a slightly chemical smell of them trying to keep the place clean. And maybe like, men's grooming products, since one of the inhabitants is a (struggling) actor and takes pride in his appearance.
For my legacy save, it would be a mess of different things. I just recently built them a new Victorian-style house, so they would get that "new wood" smell. Also burning wood smells from the fireplaces and the wood-burning stove. They have a very well-decorated house with a lot of fabrics with the curtains and beds and other textiles, so I think they might be building up a bit of dustiness. Oh! And they have two cats as well, so cat-related odors. Lastly, the father in the family keeps sneaking off to the pool when I'm not watching him, so the smell of wet mermaid, which I assume would smell like fish.
For my celebrity save, they have three children at the moment, so the smells of dirt and grass and art supplies, especially in the back hallway and their bedrooms. The father of the family is a very famous musician who tends to have paparazzi hanging around as well, so of all my saves, I think he would be most likely to consciously think about how his guests would perceive the environment, but there's not really enough stuff in the house to balance out the child smells, so it would be something more artificial like an air freshener with one of those that are marketed towards guys with scents like "black lightning" or "cool rush".
