The Chic Technique: Bunk bed and loft bed ideas. I like that the bottom bed's mattress is on the floor easier/less expensive to build; and lower height for top bunk.
This would be cute in a small shared bedroom. 20 Ways to Customize the IKEA KURA Loft Bed & Make It Your Own
DIY Taiga stencil with kids with Ikea bunk bed painted white