Actually, I think pretty much everyone at one point in the game decides to decorate a house. Doesn't have to be the one you can buy.
I decorated a house in Dark Woods. Won't say which one, because that would be a spoiler. But I got rid of all the garbage, dumped it somewhere in the forest, and got decoration from all over the world. Urns, pots, flowers, plates, chairs, knives.
It's just a shame I couldn't get rid of the spiderwebs...