Black mold problem possible clean?

You have been in the apartment and have no adverse affects, Right ? All mold starts with moisture.. Spray the mold with bleach and after the liquid is dry remove with a soft bristle brush. The bleach will kill the mold and the brush will help remove the leftover. You can also use a vacuum with a bristle brush. If there are no water leaks above you the moisture may be from when you take a bath. Make sure the exhaust vent works. If you have no vent leave the door open to help remove all moisture. If the ceiling is wet before you run the water have the management find and repair. Good Luck