I know the feeling Necro, I still remember seeing my Uncle's half-remaining corpse rotting away in his apartment 10 years ago. He died from a heart attack (he was a smoker) and none of his neighbors knew he was dead until a week later when the landlord came to collect the rent and kept getting complaints about a horrible smell.
It didn't traumatize me when me and the rest of the family went to see for ourselves (I really didn't know him that much), but I'll never forget the horrible smell of the apartment that stained my clothes & hair, let alone the image of maggots and roaches covering the living room carpet.