Anywhere outside where you can run away if it you get in trouble
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Seriously charm soloing is not braindead XP the way it used to be last spring. Charm breaks a LOT. I probably get a bit less than 1 charm break per fight. Eventually you just get so good at recharming that it doesn't matter.
At 12 you are also missing a few of the key tools (rune/berserker to keep your HP up, tash that doesn't suck, and 6 second stun to buy time).
That said I putzed around with an enchanter once and at 14 or so its really fun to charm the Rogue dervishes in WC in a group. They backstab for 60 or so, which is like 20% of a mob's HP at that level . . . .