Another option for a 200 square foot space would be the
cyclone heater as built at Wheaton Labs. It heats a slightly smaller but barely insulated cabin in Montana, takes no more footprint than the smallest woodstove once you count clearances to combustibles, and would not be dangerous to brush against at any time. It also can be built for no more cost than a pile of bricks and a few stovepipe parts.
As a batch box rocket, it only burns for a short time, stores the heat, and releases it all night with no active fire or spark danger. It requires very dry wood, but any species will be fine, as the high-temperature complete combustion leaves no creosote at all.