I wish I could open the windows, but too much dust and allergens come in. I see a lot of mention of lavender, and I have it planted all along the side of my house, I guess I should actually use some.
My sewing room can smell musty if I use the steam iron a lot. I spray the ironing board with vinegar at the end of each day, and leave the ceiling fan on.
I occasionally use leftover candles in the cup-warmer thingee. I can't tolerate strong smells anymore -- I had tried putting votive cups with Downy Unstoppables in closets and behind desk in sewing room, but it made my throat sore. Love the smell of those though!