Hi there! I'm from Levittown, grew up there, and currently live very close to there.
I've lived in a few different apartment complexes in the area, treehugginmama is right - Orangewood Apartments are some of the best when you weigh quality against price, the management is fantastic and the apartments are well-maintained and large, maintenance is very on the ball. Highly recommend them.
You could also check Craigslist out for private rentals in the area.
Avoid Levittown Trace apartments, Bristol Gardens, Foxwood Manor... Chesterfield Apartments are good as well, from what I hear. If Langhorne is an option (very close!) I also recommend Middletown Trace apartments, VERY large townhomes that are well-priced.
full time, single, slightly soggy WOHM to Juliet (12.31.2004 @ 36w5d) and Willow & Adam (2.22.2007 @ 39w5d, HBAC transfer) and... expecting my little womb warrior Eowyn Susanne in September