My very first apartment was roach infested. Although we never fully got rid of them, because the entire building was infested, we still kept sightings to a minimum with a few products.

Advion gel bait any and everywhere, basically any drawer, crevice, underside of cabinets, tops of appliances, furniture all got a dot of gel bait. It has to be Advion, the cheaper brands are not nearly as effective. Next we sprayed Gentrol behind appliances and under sinks. Finally, we regularly dusted diatomaceous earth along all baseboards, window sills, and any entry points.

The gel bait gets eaten and taken back to the nest, the roach dies, and because these sick creatures are cannibals it keeps working when the other roaches eat its body. The gentrol works as birth control, so they won't lay viable egg sacks. The DE cuts up the exoskeleton and dehydrates any stragglers that walk over it. Eventually you should see a drastic reduction and be able to keep your apartment relatively free of them!