I feel like the favorite feature in the condo inventory isn’t really made too obvious, to the point I forget it exists every now and then. I think this is mostly because the grey heart icon blends in with the rest of the inventory menu (until you move the mouse over it and it becomes bright pink).
I think it would help if the grey heart icon was darker and if there was a little pop-up that said something like “Added to Favorites” when you click on the heart, since that way the heart icon would stand out more, and what clicking the heart icon does would be more obvious.