My sewing room is in the basement, no windows. Mainly it smells "clean", I don't know how else to describe it. I'm afraid to use candles, since I might forget to blow them out, and my DS, who is an insurance claims adjustor, has warned me about using plug-ins because of the possibility of fire. I did use a diffuser for a while, and loved the smell, but when that got used up, I didn't replace it.