Open windows daily (I do all day long into the evening), febreeze mattress while you wash sheets and have the fan on.

I open my windows daily for an hour or so... common sense... unless u live in a submarine

In winter I open the windows during middle of the day, with the covers thrown back and ceiling fan on full pelt. Only for a couple of hours, then close the room up again.
During warmer months I have all windows and doors open.
The other advice here is good, especially about washing everything, including mattress protector.
Have a spare mattress protector too, so you can do a complete change of bedding, even when you can't wash immediately.

I don't want to sound like an arsehole but I don't know the smell you mean, my bedroom just smells like fabric softener to be honest because of all the clothes hanging up in the closets. Maybe you might need a new mattress? Or to have your doona and carpets dry cleaned?

Open your windows and doors
How stupid are people

As others have said, open the house during the day (warm clothing). And also, having some indoor plants, the real kind, no the plastic kmart ones, helps keep odours at bay. They literally absorb the stank and shit out fresh air. That's their job.
And don't be afraid to have your mattress cleaned by a professional. Lots of pillows are machine washable so that's easy.

Wash your sheets and blankets in hot water with bicarb, add vinegar to the rinse cycle. Spritz your mattress with clear liquor that's 50% abv or better, unflavoured. Throw bicarb down on your carpets, wait 30 mins and vacuum, try a dehumidifier, put dryer sheets or sachets of potpourri in drawers and closet shelves

Also change your sheets and wash your blankets including your mattress protector.

Open the house, clear the air. You have too otherwise you'll get mould.

Find the shoes. Smelly shoes can go through the whole house. Either bag them or leave them outside.

Open up the house. Just for half an hour or so. You should do this every day anyway, for the health of your home.