Concept of interior was simple - black walls + white furniture and white wall + black furniture. Furthest wall from entrance resembles corner of peace - there is desk for working or gaming and big shelf for books and toys. I tried to keep everything simple and not over-crowded. I took all furniture from IKEA, so it got really inexpensive.
P.S. I added 2 visualizations in HD plan .pdf. Hope you'll like it!