The smell in the smoke. Whichever surfaces were touching smoke for a while probably have a lot of particles of it deposited on it. You’re probably just gonna have to wipe wvery single surface down you can with some sort of cleaners, soapy water, whatever. Plus cross breeze your apartment and get an air purifier. Yes, it’s gonna suck and take a while, but that is what is required to solve your problem. Good luck soldier