Re: sims 3
@Chocostar2 The only way to see the furniture is to "open" the house, as happens automatically when you visit. You can open an individual house with NRaas MasterController: click on the house itself, the ground, or the map tag and select NRaas > MC > Open.
However, it's best to do this for only a few houses, at most, at a time. When the house is open, the sims inside will be simulated to some degree, with the game engine needing to keep track of them constantly rather than leaving them in the state of semi-hibernation that's typical for off-screen sims. This can add a lot to the game's overhead if it involves too many sims. So unless you're playing a very small world with only a few dozen residents at most, you'll need to be selective.
If you are in fact playing such a small world, you can instead use NRaas HomeOpener to open all the houses at once. But if you remove it again, you'll need to use MC to "close" the houses afterwards, or they'll remain open.