Answer:
Personification
Explanation:
A house can not actually feed, clothe, and rock someone to sleep. The author is giving the house human characteristics, therefore, this is personification.
The main theme is the fragility of sanity, guilt versus innocence, and the unrelenting passage of time. The fragility of sanity: the narrator's attempt to prove his sanity, his erratic mannerisms while he explains his meticulous plans for killing the old man only prove his madness.