Great location and price for your stay in DC. The Mt Pleasant neighborhood is wonderful and the short walk to the Metro and National Zoo are bonuses. So easy to access and in a quiet neighborhood. The zoo is a must see and you definitely need to visit Mt. Desert Ice Cream just a few blocks away for dessert! We went twice on our stay : ) Nice small restaurants with a lot of variety close by as well.
While it is a basement apartment, the owners have done a lot to make the space attractive and livable. It is large and well furnished for relaxing and cooking/eating. We did not cook there as we spent all of our time with our kids, so I can't comment on that aspect but there is a nice stove, refrigerator, microwave, etc.
Our only issue was with some noise from upstairs one night of our four spent there. It is easy to hear walking on the floors above. It didn't bother my husband's sleep, but did keep me awake for several hours. The other three nights were very quiet. If you are a light sleeper, ear plugs would be a good idea.
Overall a nice place at a very reasonable price, great communication, easy/private entry, good cancellation policies for flexibility, and in a great location if you are visiting DC for touring.