Adam and Jen are a very nice couple and the airbnb is fine: it is under their house with a completely private entrance. It is not large but sufficient for 2. They are available if you need something or have a question. They provide you with 2 metro cards that you can keep during your stay, and maps, information about the city and the neighborhood, etc.
You are close to H street where there are lots of shops and restaurants as well as a new streetcar which is free and drives you to union station in a few minutes!