Sure, a rented room in the back of a house isn't exactly what comes to mind when we think of homes in America. After all, isn't owning your own home part of the American Dream? From what we can tell, this bean-eating couple missed out on that particular part of the dream a long time ago. Despite the fact that they have little money and are left on their own, though, this couple has constructed a routine that seems to fill their lives – even though the entire scope of their lives is contained within one tiny room.
The "home" in this poem is a sanctuary, a haven for the couple.
The home in this poem represents the broken dreams of the couple.