STAY HERE!! I can't say enough amazing things about Pamela and her home. We arrived with 4 children after an evening flight- hungry and tired. There was milk, cereal, juice and bread waiting for us as well as fresh scones! It was just what we needed. The kitchen is more well stocked than my own. We were able to cook meals for ourselves and used instacart to order groceries delivered right to the house.
The location is perfect and incredibly convenient. An uber was ~$65 from BWI airport and $10 from the house to the Smithsonian. There's a park for little kids a half mile away and it's a beautiful walk through the neighborhoods of DC. There are 2 bus stops in front of the house, so I'm sure you could use the bus as well. We also walked to H street, where there were multiple restaurants.
We took advantage of the quiet back patio to read and in the evenings made a fire in the fire pit out front. The beds were incredibly comfortable, with TVs in every room. The decor is beautiful. This was definitely one of the best air B&B's we've ever stayed at and would stay there again the next time we're in DC. I can't recommend this home highly enough.