I hate 2v1 personally, but then again it probably isn't that hard if you use summons. (unlike qualaag this one acutally does something useful, seriously my last playthough the butcher lady didn't even come in to the fog and i have to dispense the remaining that was planned by my summon health with a lovely dagger)
Dragon, but this one's a no brainer.
Really no boss is hard if you go dark bead/crystal souls spear mage...