Hi, The limitation of space makes me consider to use custom furniture, so the space become more efficient with this layout arrangement. i put the bed at the end side of the room and use 190 cm long x 90 wide bed. it's smaller size but i think that should be enough to a 3 - 10 years old child. i added some cabinet so the kids can keep their toys or book in that storage cabinet. there are some electrical work to do here to connect the light to brighten up the down side of the bed and to add power outlet there. i put the desk plus mirror and some other upper cabinet to keep other things that might be used by them. the color scheme i used to this room is yellow and turquoise blue. i hope they like the color and add some warm to their space.