Very unwise and Coleman specifically tells you not to do it. During the blackout a couple of years back I just took mine out on the balcony and cooked out there. Could be unpleasant in a storm, though.
This is a text lift that's standard in Coleman instruction manuals:
CARBON MONOXIDE HAZARD This appliance can produce carbon monoxide which has no odor. Using it in an enclosed space can kill you. Never use this appliance in an enclosed space such as a camper, tent, car or home.
Thanks!