M.G.
We won a designer once - but it was more for colors and how to choose flooring and paint colors. It was extremely helpful though and I can see why people use them.
I wonder if there are Pinterest type sites that you could look at where you could type in 2 beds small room, etc. and get ideas for IKEA furniture, so at least if you do it on your own, you could see what would work? Houzz is a site that has a lot of pictures.
Pottery Barn Kids (and I'm sure other kid furniture stores) offer free design consultations - will come to your home I think. I know not quite like IKEA but for the convenience, might be worth it. I would just make sure it grows with your kids.
Speaking from experience, kids outgrow that kiddo look (and small furniture) so quickly. They quickly hit that tween stage.
Good luck :)