Have you run a dehumidifier?

vinegar in small bowls placed around the room can absorb odors

Baking soda, just having candles out even if they're unlit. You might even try bowls of bath bombes. It's rough stuff trying to get rid of smells in small spaces though!

Follow these tips to get rid of bad smell in the house-

1. Put a half slice of lemon in an inconspicuous place in the house or rub a little vanilla on the light bulb. It will help to perfume the air naturally.
2. To neutralize bad odor, sprinkle some baking soda in the room for several hours and then vacuum it.
3. Open all windows and let the fresh air blow through the house.
4. In case of mold, seek professional help from a mold removal company.

1. Try to identify and eliminate source of odor, and in the meantime...

2. Try Zero Odor Spray. You don't want to add an odor, you want to remove odor. I use this if we have cooking odors in our small home and are expecting company or just don't want the odor to linger. Works really well.

https://www.amazon.com/Zero-Odor-Multi-Purpose-Household-Eliminator/dp/B001J0C3OQ