Since winter tends to be pretty cold where I live my main concern would be heating. As has been said before, furniture makes lousy firewood and giving off all those toxic fumes I don't think it would work indoors.

In an emergency we'd probably move to the smallest room in our apartment. I would attempt to insulate the windows as best as I could and make a makeshift shelter so that we could stay warm even without heating if absolutely necessary. In a pinch, we could move to the basement. A lot warmer down there if the heating is gone but much less comfortable.

Otherwise, making a small wood stove from a large paintcan is not difficult if you have access to firewood. Even an alcohol stove could be improvised easily but fuel is again a consideration. I think we could make it for a week or two at most. Of course, that's all theoretical because I've never had to do it for real (hope it stays that way)... Maybe I'm less prepared for that kind of contingency than I thought!