Your Calathea will do best in medium to low indirect light. Never allow this plant to receive direct sunlight, as the leaves will burn.
For best results, maintain a regular watering schedule and keep your Calathea moist, but not wet or soggy. This is not a drought-tolerant plant, but it is relatively forgiving if you forget to water it from time to time. Extended periods of dryness can result in brown leaf tips or edges.
Like many tropical indoor plants, your Calathea prefers a spot with ample humidity. If leaf edges begin to curl or brown up, mist them with lukewarm water on a regular basis, or place a humidifier nearby. Your bathroom or kitchen are perfect spots for your Calathea because these areas tend to be more humid.