Would be fun kid hideout space! Awesome dog kennel under the stairs design idea. If you want an indoor dog house, utilizing the space under the stairs for a cozy, attractive and practical space for dogs is a good idea! I love this design.
These crates are from Coburn Canine Crates. Most beautiful looking wooden dog kennel/cage I have seen and best prices! They even use special, non toxic wood that has the sugar and starches baked out of it so it is less appealing to chew! https://www.facebook.com/Coburn-Canine-Crates-1835960383341974/