Attached valance sets are a style choice, not the default answer
Lace curtains with an attached valance can work, but only when the room actually wants the extra decoration. They are strongest on smaller windows where a short treatment feels natural and where the added top detail helps the window feel finished rather than crowded.
The mistake is treating the valance as free decoration. In a busy kitchen or a room with patterned tile, shelving, and trim, the attached top layer often adds noise instead of charm.
Where attached valance sets still make sense
These sets tend to work best in cottage kitchens, breakfast nooks, and traditional rooms that already accept a little more decorative softness. They can be especially useful when a plain short panel feels underdressed but a full layered curtain treatment would be excessive.
If you already know you need a short treatment, the short lace curtains roundup is the clearest next step. If the question is really about proportion and drop, the lace curtain length guide will save more time than browsing more listings.
Keep the room in charge
The right attached-valance set should support the room, not dominate it. Favor cleaner lace patterns when the rest of the room is busy, and only move into fuller decorative trims when the window has enough visual space to carry them.