Don't crappy apartment basically is a sign of how he has lost touch with life outside of work. He doesn't even bother putting in the effort to have a nice place, not trying to keep up his polished appearance once he leaves home. Just another general symptom of his downward spiral, presumably it'll start creeping more and more into his work until some cataclysmic turning point wakes him up and gets him moving forward again. But he is still polishing his shoes. The cataclysmic turning point will be when he shows up for work with scuffed wingtips.