Plenty of open windows if you can bear the cold at this time of the year.
Air fresheners (but not the PLUG IN type which are dangerous as they can cause fires.
Aromatic oil burning containers (the type which you use with a tea light candle). Lavender oil is particularly good for removing smells such as paint and the smell of cooking fish.
I have heard the vinegar in a bowl works, also try scented candles when you are painting and keep an eye on them when you have left the room. They seem to help with a smoky room too.