I've seen some very filthy residences in my time, but I haven't seen anything quite like this. No doubt the man is suffering severe mental illness. To even ENTER that place takes guts. One can only imagine the bacteria, bugs and disease residing in there.
Without exaggeration, if I was the owner/renter, I'd dismantle the entire structure, burning everything in a huge pit fire.
I'm a dude living alone, and although I'm on the OCD side of cleanliness, seeing such a disgusting living space almost makes me nauseous.