Cute idea for under the stairs for the kids. Especially if you want to make your playroom in the basement next to you laundry room or entertainment area. Just make a little playhouse under the stairs.
11 Incredible Kids Playhouses Under The Stairs | http://diyfunideas.com/incredible-kids-playhouses-under-the-stairs/
10 ways to use space under stairs, closet, stairs, storage ideas, playhouse
10+ Kids Under Stair Playhouse DIY Ideas and Tutorial
indoor playhouse with upstairs loft and cube storage stairs