Metro system in DC is not that bad, so stick near a major hub on the Blue or Orange/Yellow line...and your need for a car goes way down. I live on the Hill and unless you work the Hill or car commute against traffic (ex: DC to Quantico or DC to points South/West)...don't recommend. As mentioned, Anacostia, no man's land down there...stay away. I see a lot of the younger DoD crowd in Reston and Crystal City (easy to spot), easy walk or metro to Georgetown and Old Town from there. Rt 95 is a parking lot coming into the area in the morning....and reverse that cattle train in the evening. Rt 50 and 66, same deal.
Note...parking in this town is a PITA. Metro is your best bet, $230 is a great deal for the footprint of travel it gives you. DC is a great town, so I recommend exploring via Metro when you arrive. Parking fees and tickets, well you may think $230 is cheap after that. You might also want to look at getting a Bike Share pass https://www.capitalbi...re.com/stations. That is a recent up and coming ("STS" appropriate?) way to commute these days. Can't swing a dead cat in this town without avoiding someone on those red bikes. Kidding aside, a lot of my co-workers Metro in from VA/MD, and bike the rest of the way into work. It's even a better way to move around the city. My wife has been a resident a lot longer than I have. So if you have specific questions...PM me and I will bounce them off of her.
Cheers
Collin