A friend of mine has an entire room in their house they call the "Shit Room". It's full of random shit from multiple decades ago, and is also where they let their pets run free. It smells like hamster shit, probably because that's what's in there. There is not a bathtub in his house that is open, his room is soundproofed by the sheer number of clothes all over and it and posters piled on top of posters. The basement is technically furnished, but is really just full of random shit. There's a bed in there, but you wouldn't know because it's piled in moldy clothes that haven't been moved in ten years. There are multiple old game consoles that have turned into ant farms naturally, and you can't see what the couches actually look like through the piles of clothes, pillows, and a VHS tape here and there on top of them. The only thing that you can sit on that isn't covered in something is an exercise bike.
The real kicker is that he's fifteen and this is his parent's house.