If I could move anywhere in the area, I'd move to Rosslyn. It's convenient and it's a short hop to the whole city. It's on three metro lines that can get you to both nearby airports, and you can literally walk to Georgetown. Ballston feels very, like, manufactured to me. Obviously the area right by the metro station is very built up in Rosslyn, but there are a bunch of great restaurants and things a few blocks up the hill. Rosslyn all the way, honestly. I live in Courthouse and I wish I would've gone to Rosslyn. Ballston feels like living in a mall.