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A. Find every single effing hole, crack and gap. These need to be filled and sealed, copper mesh is better than steel wool. It won't degrade over time, rust and rodents truly hate gnawing through the stuff. https://www.homedepot.com/p/Bird-B-Gone-Copper-Mesh-20-ft-Roll-for-Rodent-and-Bird-Control-CMS-20/205862497 B. Pull out and look behind every large appliance (fridge, stove...) and look for holes/evidence of rodents. Clean those areas up with strong cleaner (to eliminate any food sources, rodent waste such as pee, and fill/seal all holes, gaps, etc.... C. Traps.... Snaps traps can do decent job if used and baited properly. You really don't need to but much if any bait, maybe a VERY light trace of peanut butter. It's the scent you're after, not providing a meal. When handing traps wear latex or some other gloves to avoid transferring human scent. Place traps properly. Rodents have poor eyesight and ideally traps will be placed in ways that they will simply run into/over them. Rodent zapper traps are the bomb. https://www.amazon.com/Electric-Powerful-Reusable-Electronic-Warehouse/dp/B0FBWY5M3F For large infestations look into multiple catch traps. https://diypestcontrol.com/rodents-animals-control-products/mouse-control-products/mouse-traps It cannot be stressed enough, you need to have your apartment mouse/rodent proofed. Otherwise long as rodents are in building they will continue to find ways into your apartment. Good mouse proofing means finding every single effing gap, hole, crevice, etc.. and sealing. This means inside closets, under heavy (and seldom moved things such as bookcases, kitchen appliances...) In kitchen besides checking under sink other area of worry is behind any built in cabinetry such as around sink. Quite often over years gaps, cracks and holes (often made or exploited by rodents) which can allow vermin to enter. It is impossible to seal those voids without ripping out cabinetry which is why many property owners don't or won't bother. People have renovated kitchens and upon removing built in cabinets found vast evidence of rodent infestation.