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.
Color palette # 1323 Cold shades of peacock feathers use in bedrooms. Violet, Lilac or Blue Beyond, Blue-Green/Teal, Light Asparagus or Haven Green, and Isle of Pines or Kale Green. would be a fun mix of colors for the guest room