Cast iron plants are native to the forest floors of Japan and Taiwan — aka they're used to very little sunlight — so they won't mind a dim home. Direct sunlight can actually burn their leaves, so you should keep them near north-facing windows to prevent that, or just place them away from any windows at all. If you listen closely, you can hear them whisper, "Hello, darkness, my old friend."
Sun: Besides direct light, any exposure will do
Water: Let soil dry out between waterings