Does linen sleep cooler than cotton?

Yes. Flax linen breathes and moves moisture away from the skin, so it feels cooler than cotton-poly blends in warm rooms. Cotton percale is close, but linen stays drier.

Will it feel rough at first?

New linen has a dry, slightly stiff hand. It softens noticeably after a few washes, so the first nights are the least comfortable.

How should I wash it?

Wash cool or lukewarm on a gentle cycle and tumble low or line dry. High heat is what causes linen to shrink and wear faster.

Does it come with a flat sheet?

The set is a fitted sheet with pillowcases. There is no flat sheet, so pair it with one you already own or buy separately.

Will it fit a deep mattress?

Linen has little stretch, so check the fitted sheet's pocket depth against your mattress height before buying. A shallow pocket will pull off a thick mattress.