it was east that was easily farmable. youd go in (through the northwest entrance to east from the courtyard), jump down onto a ledge below, run round, head in past the water elemental boss, up to the demon bosses, back to the courtyard on the upper level again (but from the other side) jump down, send a rogue to talk to the tree so he'll open the door for you, then go through and kill the final boss. 4 bosses, 20minutes. but apparently theyve changed it in 1.8 to make it less farmable. (all i've heard of this was one of my guildmembers going "blizzard fuckers have nerfed DM east boss runs!" to which i replied "bastardos" and got back to my jailbreak run
it was actually a hard farm to manage until youd got some practice (in early runs, we tended to clear too much, could easily take us more like an hour... but once you realise that all you need to kill is the 4 bosses, 3-4 groups of mobs (2 of which take about 20seconds each if you have a warlock) and a few patrols of 1 mob each, it really doesnt take long