Calathea is a genus of plants belonging to the family Marantaceae. There are several dozen species in this genus.
H: 70 cm
D: 50 cm
Water: This plant demands to be moist at all times, but not "wet" or sitting in water.
This means regular small amounts of water during the growing seasons as soon as the surface starts to dry up. Although the plant will let you off a little and accept less water when things turn cooler and darker as winter approaches and takes hold.
Site: No direct sunlight for Calathea's otherwise you will lose the markings.
On the other hand very dark spots need to be given a miss as well. A North facing windowsill would be the first choice here. For a Calathea to thrive as a house plant, high humidity, warm temperatures and lots of water are needed.
Pot might vary upon availability.