I'd think a bunch about your useage pattern - If you aren't going to be living in the building most of the time, how will it be heated (if at all), and to what temperature?
I'm guessing, but I would suspect that your normal process will be to keep some kind of "conventional" (Dino farts, electric, etc) heating system on to maintain a minimal "keep the pipes from freezing" temp most of the time, (You didn't mention a bathroom, but if you are having a guest room I'd assume there was one, maybe a kitchenette and/or bar....) except when you are having guests.
When you do have company, I'm guessing just beacause it seems to be in the nature of such things, that you might not always have tons of notice; so you might well want a stove that will heat up very quickly, and throw LOTS of heat over a short time to get the playspace up to temp ASAP. Presumably it would be nice to be able to turn the heat down for an occasional overnight burn (I noticed the guest rooms) but that doesn't sound like it would be as important to you.
I would probably think your best bet would be a BIG stove in plate steel or cast iron (for rapid heat up) with a good convection blower system that will allow you to build a honkin' big fire to get the place warmed up and be neat to sit around, then allow you to turn the heat down once things were cozy. Since you sound like this is an entertainment space, presumably having a big window to view the fire through, and / or possibly having the option of a fire screen or leaving the door open so the kids could toast marshmallows or make popcorn, etc. might be useful?
Not sure what your best bet would be, maybe a Quad Island Royale? Extra Large Dutchwest? VC Encore or Defiant?
Gooserider