if you put coffee powder on a small cup in your room it neutralizes the bad smells.
I put one on my desk around a week ago and now my room smells like coffee.
just a suggestion
In my experience bad smell mainly comes from worn clothes, rotting organic trash and unwashed bodies. I got rid of it by using an airtight laundry basket and trash can and showering daily. Also opening the window twice a day.
I figure doing that would make the coffe smell even better.