Where to put her?
A lot of light but no direct light from the sun. In the summer you can take it outside on a sheltered spot. It would be better, though, to place it somewhere light but cool inside your house.
Water and nutrition
Do not let the soil dry out. On the other hand it should not be kept too wet either. Water should be able to drain away from the bottom of the pot, or else the roots might rot. Be careful: in the summer it needs a lot of water. Add a little plant nutrition to your pouring water once a fortnight.
The cooler the plant’s surroundings, the longer the berries will remain on the plant. In the winter a minimal temperature of 16 degrees Celsius is fine. Avoid keeping your plants close to a heat source. Radiators for example create an environment of low air humidity. The berries could fall from the plant and the leaves could shrivel.
We are required to inform you that the plant you have bought is intended for decoration, not for consumption.