I bet that room smelled to high heaven of cat spray. We had a woman who had lots of feral cats around. her house smelled so bad it took your breath away when you went in.
Her car smelled, she smelled.
I always avoided going inside her house for any reason. I told the wife I would wait outside, YOU go in.
There’s a product call Urine Destroyer made especially for cat urine (spray). It works pretty well on relatively hard surfaces. Not so much on rugs.