The thing nobody mentions when you buy a diffuser is what happens to the oil at the bottom of the bottle once it's down to the last inch. It gets thick and sticky, and those reed sticks start pulling up less scent, not more, no matter how many times you flip them. You'll swear the room smells like nothing by week six, and it's not the room, it's the oil doing exactly what oil does when it's nearly gone. Nobody tells you that in the shop. You just have to live with one for a season to learn it.
They're not the right answer for every space, though. A diffuser in a small bathroom with no window gets overwhelming fast, and in a kid's room I'd skip the reed kind entirely, since a toddler finding those sticks within reach of a glass bottle is a bad afternoon waiting to happen. They're also not great if you want scent on demand, a reed diffuser is a slow, steady background note, not something you can switch on before guests arrive. For that you want a candle or a spray, something with an off switch. What a reed diffuser is good at is holding a quiet, consistent smell in a hallway, a living room, a guest bathroom, somewhere you pass through rather than sit and notice.
They sit well on a console table, a bookshelf, the back corner of a kitchen counter near enough to a doorway that the scent travels but not so close to a stove that heat changes how it throws. Check the bottle neck when you buy one, a narrow neck with too many reeds crammed in will flood the room in week one and leave you with nothing by week four, you want a handful of reeds, not a dozen. Check the bottle itself for a solid, heavy base too, glass that tips if you brush it with a sleeve is a wine stain on the rug waiting to happen, and I've had the stain to prove it.
For sizing, think about air that moves rather than square footage on paper. A room with a draft from a window or a door that opens often will eat through a diffuser twice as fast as a closed, still room the same size, so don't judge how strong one is by the first still evening you notice it. The mistake most people make is buying one diffuser for an open plan kitchen and living room and expecting it to carry across the whole space, when really you need two smaller ones, one at each end, doing a gentler job rather than one bottle working overtime.
It's a small, steady thing, but a room that smells the same every time you walk into it starts to feel like it actually belongs to you.
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