Well, they both deal with people dealing with inner demons. In "Usher", Roderick matches the house (stately) but the inside matches him as well (crumbling, in disrepair). In Jekyll and Hyde, Jekyll is the outside of the man (respectable) while Hyde is the inner being (short, ugly, and violent). We see the decay and ruin through the eyes of an outsider narrator, and both end with the houses (Usher phsyically/mentally and Jekyll the same) coming crashing down. There is a sense of creeping horror, of madness coming from within to destory the good within man. Hope this helps.