Answer:
The main setting it the old man's house, the secondary setting would be the murders house where the cops interview him.
Step-by-step explanation:
The main setting would be the victim's house, where the story mostly takes place. In this story, we go into his house where he will stalk, kill, disembodied, and clean up his mess. From there we will go to the second setting, the murders house, where the cops interview him, he will get great paranoia from the supposedly beating heart, he'll confess, and get arrested.
Hope this helps! Edgar Allen Poe is one of my favourites, especially in audio.