Odorless??? just dont brew up a batch of Apfelwine, hahaha. The odor only lasts for a short while, it is primarily contained to the room and adjoining area for a short time, it is manageable to some, namely you and those who appreciate the final outcome...but my x-wife hated it when I fermented in our walk in closet, she went off each morning during primary ferment smelling like #$%# as she so kindly put it. But, she is an x now so HAHAHAHAHAHAHAHA. no really, it is not that bad. The dangerous part, well how safe are you, do you live above people or are you on the ground floor. If your above people, then you better be extremely safe when your carrying that full 5 gallon glass carboy across the linolium/tile floor, it will make an ungodly mess and leak to those below and that my friend WILL smell to high heaven for a long time...otherwise, safe yes. its not flamable, but you do need a big burner to cook with, not any more dangerous than a BBQ in my opin.