Peperomia plants grow best in bright indirect light provided by a west or east facing, window. They also do well under florescent lights. Insufficient light causes this slow growing plant to stop growing all together. Direct sunlight burns the leaves.
Repot only when the roots of the plant have out-grown the existing pot. Always move a peperomia plant to the next size pot only and be sure the pot has good drainage. Putting a peperomia in a pot that is too large allows the soil to stay wet too long and causes root rot.