We moved into our current home about 2 years back, but never got around to decorating it properly and I want to start with converting the guest bedroom into a proper room for DCs. They are currently sharing the box room with DC1 (almost 8) in a high sleeper and DC2 (3.5) in a cot bed under the high sleeper.
I've attached a picture with rough dimensions of what would be their new room. I cannot decide whether I should get bunk beds or 2 single beds. If you had to design this room for 2 kids with beds, a wardrobe, a desk and some storage for toys and books, what would you do?
There is a radiator under the window and the window looks onto our south facing garden and can get really hot during the day.
I'm really bad at imagining spaces and can't afford an interior designer 
Probably why I'm yet to decorate our home 
Any tips would be highly appreciated!