Light: Peperomia Metallica does best in medium to bright indirect sunlight. Do not let sun hit the leaves directly. They can tolerate lower and indirect light, but they are not suited for direct sun.
Water: Peperomia Metallica should dry out between waterings. Once a week is just fine, but checking the soil is best. If the top two inches of soil are dry, it's ready for water.
Humidity: Any humidity inside your home is great for a Peperomia Metallica