As the other commenter said, the 16 buses have a stop in front of the apartment complex (very short walk no matter where in the complex you are). If you know where you’ll be working you can use the trip planner on the WMATA website to see what your route would be like.

Westmont Gardens

My apartment complex in Arlington is $1470 for a 1 bedroom and utilities are included. The buildings are old, but they’re well kept and there’s a pool and fitness center.