Charlie likes
Indirect light
They prefer bright, indirect sunlight - try putting them just out of the way of a south-facing window. They won't be happy in direct sun.
Light watering
Allow the top 2-3 inches of soil to dry out before watering them again. We recommend small but frequent amounts of water. Keep in mind, though, that they are susceptible to root rot, so don't overdo it.
Warmer temperatures
Try to make sure that they don't sit too long in temperatures under 15 degree, they don't love the cold.