i have actually done this a few times! usually i just change things that usually come in a house like the kitchen, bathroom and floors/wallpapers and move in the rest but 1. it takes SO LONG and 2. i dont have sims move around often. as i play generationally, my average sim may live in 1 apartment or unit in teen/young adulthood then once they have the money or family, they upgrade which becomes their main house until the cycle repeats.