Pull out Wardrobe Rail for under stairs. You could have a few of these attached under the higher stairs and some storage boxes or even a chest of drawers underneath, then you could do away with the black frame and the room would look / be much larger.
Pacco Floating Drawers from Mocha - Perfect for small spaces; Pacco is a floating shelf with concealed drawer. Handmade in solid ply, a discreet grip underneath allows you to slide the drawer open. Designed by Samuel Ansbacher. http://www.mochacasa.com/shop/pacco-floating-drawer/
Love the Scandi schic monochrome kids bedroom style? You're going to need this must-have shopping list to get the look. black and white kids bedroom, monochrome nursery, modern home. Scandinavian style