If you have mold, the first job is to work out why, and fix the source, otherwise it will just keep coming back.
Is there mold on a specific surface like a wall or the corner of a room - if so, could there be a water leak somewhere? Alternatively, is there not enough airflow through the apartment? Are you using a gas heater that's causing condensation?
To get rid of the mold, spray it with tea tree oil (available from health food shops) in water. 1 teaspoon of tea tree to one cup of water. The easiest way is to put it in a spray bottle, spray on, then scrub it off. No need to rinse. Caution - don't store the mixture in a plastic bottle long-term, as tea tree eats through plastic.
Bleach will remove mold temporarily but it won't kill the spores so it will just keep coming back.
Dust mites - you need a good vacuum cleaner with a HEPA filter. Add some drops of eucalyptus oil when washing sheets etc.