A.K.A. the Deshler-Morris House, where George Washington really did sleep! From the National Park Service site:

President George Washington also briefly occupied the Deshler-Morris House, a two and a half story stuccoed stone house at 5442 Germantown Avenue. The National Park Service restored this building to the way it looked when George Washington was the occupant between 1793 and 1794. A group of dedicated volunteers provides tours of the property, while the National Park Service continues to maintain the house and grounds. Here in 1793, the executive branch of the government dealt with the problem of Edward Genet, the former French minister. He had commissioned privateers in American ports to prey on British ships along the American coast and in so doing jeopardized relations and risked war between Great Britain and the new nation. The next summer, Washington rented the house again hoping to protect his family from yellow fever, while he carried out his duties as president. The home became known as “the Summer White House.”
My mother Liz says she was given a lot of reading to prepare herself to give tours. I’m not too worried about qualifications, as we had framed pictures of Germantown on our walls growing up (she carefully cut out her favorite scenes from a neat old book and framed them herself with red felt matting!). I think the “summer White House” was actually one of the pictures on our walls!