I stayed at Barbara's place for a few months while I was interning in D.C. and it was perfect. You're an easy bus ride or about a 20 minute walk away from a metro and tons of shops and grocery stores.
You have access to whatever you need, and Barbara is willing and available to make your stay as wonderful as possible. On top of that, she is a very thoughtful and gracious host. I would absolutely stay with her again!