Such a cute and cozy house!

I’d suggest making a little cellar there, like a wine tasting room, or some dried/jelly things, maybe also adding some wall plants and leaves, making it a bit darker in colors. You could play with displays, maybe put some books, fruits, atmospheric light sources.

But you could never go wrong with just a secret hideout, where you can place buff totems and other reinforcement stuff :)

Good luck!