This is a teardrop-shapped room, with the narrowest part on the West, where you enter. Flanking you are two Reapers, one at the far North, and the other at the far South, and a line of chests sit along the far East wall behind a small stone wall. The wall serves to protect you from the Mimic in the middle of the chests, but does not impede your progress, as you can walk around it in either direction.
The Reapers' sleep fields make this a frustrating fight, but not a very difficult one.
The only other thing to note is that the first two wall sections to the North (at the entrance) are both secret doors, but aside from allowing you to stand in them, they go nowhere and seem to do nothing.