Find a room in Redstone Mines with at least 2 mob spawners.
Use a weapon with a big attack area, preferably a double axe but a glaive works well if you stand with your back in a corner.
Use any armor with Final Shout. Equip a healing totem and any two other defensive items - here I'm using a gong and pet wolf. The defense amulet is a good choice, too.
Follow me on Twitch where I play games while NOT AFK - twitch.tv/Tkeleth - I stream VERY late hours US eastern time (about 10 pm to 4 am, still working on the schedule).