There is no one good indoor plant for me to recommend. There are many. But only you can make the right choice based on your preferences and situation.
What size plant do you want? Do you want an up-right plant, or a shaggy table-top plant? Do you like succulents? Would you prefer a flowering plant? In addition to considering the amount of light available, think about the location of heat sources in the room; many plants will not thrive if placed close to drafts from heat sources. How much care do you want to provide? Some plants require a lot; some very little. How will you water it? At the sink? Then you will need to be able to carry it.
Oregon State University Extension has information that may help you make a selection. Please check out these links.
- How to buy healthy houseplants. http://extension.oregonstate.edu/gardening/how-buy-healthy-houseplants
- These houseplants flower all year and make great gifts. http://extension.oregonstate.edu/gardening/node/941
- How to keep your housebound ferns healthy. http://extension.oregonstate.edu/gardening/node/932
As a brief postscript: While each plant can benefit air quality, no one plant can significantly change air quality. Because you mention air quality as a consideration, I've attached a link to a publication "Help yourself to a Healthy Home" by the U.S. Department of Housing and Urban Development. http://www.hud.gov/offices/lead/library/hhi/HYHH_Booklet.pdf
Thanks for asking.