anyone know how to get rid of mildew smell?

The smell is the damp, so it'll keep coming back until you find where the damp is. Look behind furniture pushed against outside walls, inside wardrobes, under the sink and round the bath. A cheap hygrometer helps, you want the room under about 50-60% humidity, and a dehumidifier does that fast in an older place. Then the cleaning: hard surfaces with diluted white vinegar, leave it ten minutes, wipe. Fabrics in the wash with a cup of vinegar in the rinse.