I used a candle once and set one of my quilts I was working on, on fire lol. I usually have fresh air from the outside. The only smell in here is the Fabulouso that I wash the floor with and the spray starch. I keep it dusted as my long arm is in here and my computers. I only sew and cut in here.
Now if you asked me how my quilt and doll room smells.....I have all the quilts rolled on tubes in one corner and the dolls on long ceiling shelves. I put those large soaps that come from Spain, France etc placed all over the place. That room smells divine lol. Some of my fabric is in this room in a huge cupboard and in the dresser drawer. All my fabrics are washed before they are stored.
If you are having a musty smell, it would be a good idea to check for dampness.