4" Sansevieria Zeylanica
This guy never goes out of style. Perfect for beginners, great for low light situations, and is often said to be one of the best for your air quality.
Thrives in bright indirect light, but it can handle low light conditions too. Only water when completely dry, then water thoroughly and allow for a long drying period. If the soil is at all damp, do not water this plant :)