Here are some of my favorite products to maintain a fresh and clean living area:
Febreze. I have been using this product since my first year of college. I really like this spray because it stays true to what the company advertises it as. Like most college students, my living space isn't the largest. Whenever my roommates and I cook, or after we have a lot of people over, the apartment can get a little stuffy and not have the freshest scent. Although this product may be a little strong (which is why I try to use as little as possible), it works to eliminate odors, rather than cover them up. The best part: it actually works!
Coincidentally, every year I have a roommate with a weak immune system, leading them to be frequently ill. To prevent from getting sick myself, I like to wipe down the counters with these disinfecting wipes. They aren't the best at picking up dust, but they work great for getting rid of cold/flu germs.
I haven't used this product as much as the other two. This Lysol spray is pretty similar to the Clorox wipes (because it is also a disinfectant), except you don't really need to wipe anything away. I guess you could use this if you are feeling lazy. :)
You can get these products at your local Wal-Mart, or Target...pretty much any place that sells household cleaning items.