The 2014 edition of Lamentations of the Flame Princess adventure, Death Frost Doom, says that it is "suitable for low level characters". I've read the adventure thoroughly, and am aware that it can be randomly deadly for any level of PCs, but I would like to hear from people who have actually run the adventure as to the optimum PC level for a one shot. I read recommendations for the 2009 edition of levels 3-6.
I want to run the adventure as a one shot, and for it not to be a TPK because of the PCs being too low level, or too easy if they're too high. Again, I know there are many level-independent ways to die.