Do a little bit more research on this method.
Yes, you use charcoal. What you do, is you burn it OUTSIDE, then wait for all the smoke to stop, and for all the charcoal to turn white. THEN you take it inside.
An airbnb is a good idea, but doing it in a big room is a bad idea. Doing it inside of a smallish bathroom would work. You could lay down in the bathtub. You could put blankets and pillows in the bathtub to make it comfortable.
So you burn the charcoal outside. Then after the coals turn white, you bring them into the bathroom. THEN you close the bathroom door, and wait OUTSIDE OF THE BATHROOM for carbon monoxide to build up in the bathroom. Use a towel to block the bottom of the bathroom door outside, so CO doesn't leak. Wait 30-40 minutes. Then you go into the bathroom, and use a towel to block the bottom of the bathroom door inside, so CO doesn't leak. Lay down in the bathtub, close your eyes, and drift off into eternal bliss.
CO detectors look just like smoke detectors. If you see either, just open them, and take out the batteries. If they're hooked up to the electrical system, and there's wires plugged into it - just jerk the god damned things out of the wall. Break them with a hammer, fuck it.
The amount you should use for a small-ish bathroom is 2 pounds, to be safe. You can use 3 pounds, too, if you're feeling frisky. If you want to be overkill, use 4 pounds!
I hope I've helped.