Air Purifiers

I live in Australia and I need to buy a air purifier for a room which smells really bad. I want to turn the room into an office. It smells so bad I can’t think.
The windows need repairing and the plaster wall probably has dampness in it. Smells like mold. The room has been newly painted.
Fixing it is not an option for now as I’m renting, and getting them to it fix may take a really long time. If ever…
Leaving the windows open is not enough. I want to remove the smell of mold, new paint, vinegar and bleach.
Would an good air purifier remove the smells?
Which one should I buy?

Here are a few I’ve seen advertised on the internet.
IQ air GC MultiGas
IQ air HealthPro 150
InnovaAir E20 Air Purifier 90
Air Purifier Zalmandn NBA350 5.00

Are the more expensive air purifiers better than the cheaper ones?
Do they work at removing odors?

I’m looking for a air purifier that uses a HEPA filter, NOT an ionizer. I live in Perth, W.A. and can’t seem to find them anywhere. I’m talking about ones by brands such as Hamilton Beach. They don’t sell them at Big W, Target or Retravision. I looked on a few online stores that ship to Australia but they only sell a few cheap Ionizers

Help anyone?