If this place is available for when you’ll be in Washington then just stop searching and book it now - you will have an amazing stay.
The location is literally 3 mins walk from the Capitol building. If you’re a political junky then it’s particularly brilliant - I kept expecting to bump into CJ or Josh in the street! The metro is a similar distance and allows you to access all the sites. There are also always lots of Uber’s circulating in the area.
The town house is beautiful and has everything you could need for a comfortable stay including a well serviced kitchen with plenty of pans, utensils etc. The washing machine and drier are very useful for those on long trips.
The hosts are very responsive and have lots of helpful local info and touches to the house that make your stay so easy. They have clearly traveled a lot and understand the little touches that make traveling life a bit easier.