RE: Tiny
I saw a movie a while back of one of the new breed of 30 inch profile, flat winged electric 3D models being flown in a guy's Rec Room indoors. It was mostly hovering type stuff but I suspect that's what you want. But your flying skills need to be up to the task and you must like doing that hovering stuff. This type of model can also do decent enough close in tight slow speed flying as well. But here again your skills need to be up to it. It's not that these models fly THAT slow but that they can be constatly turned and tumbled to keep them in close
Another option is that carbon rod and clear covering model that is often used indoors. The one with the big V tailed "mouse ears" for all flying surfaces. I saw one of those being flown in a very small area.