a flyblown bar on the edge of town.
a seedy district.
a squalid overcrowded apartment in the poorest part of town.
sleazy characters hanging around casinos.
sleazy storefronts with...dirt on the walls.
sordid shantytowns.
squalid living conditions.
the seamy side of life.
the sordid details of his orgies stank under his very nostrils.
the squalid atmosphere of intrigue and betrayal.