One of the cool features of VF2 is that you can use the rooms for anything you want. I haven't finished the whole house, but I've done the upgrades for the first three generations.

If you put in beds, they sleep in beds when they think they should sleep, but when they simply want a nap, they continue to do that on the sofa.

I put the washer and dryer in the little room that's just off of the bathroom, and my family carries laundry to it.

So, yeah, they find the stuff wherever you put it, though they'll still nap on the sofa from time to time.