Just wanted to second the pp's advice - you should not deal with this yourself. Your landlord is probably liable for the repairs, plus there are some nasty illnesses that can arise from sewage contamination - you may want to seek advice from specialist companies that clean up after floods etc. Of course, I have no idea how eco friendly would be....but it wouldn't hurt to ask, right?
Good luck - keep us posted, huh?
Good luck - keep us posted, huh?