Great Jumping off point for Capitol Hill and the Mall. Visited with my family of 4 and we easily fit. The kitchen and eating space have all you need. Little grocery about 5 min walk away. Check-in/-out couldn't be easier and Lara & Alex have a great communication set up.
About a 10 min walk to the Capitol or Union Station for the Metro. If you travel light, you can walk to Union Station or Archives Metro station and get to DCA easily.
The mall is pretty big, so it gets to be quite a walk by the time you get to the Lincoln Memorial, but it's beautiful. If you want, go out on Constitution Ave to grab a scooter.
You can hear a little noise from above and from the street, but it's certainly not a problem. The wifi signal doesn't quite make it out of the main kitchen/living room area, so keep that in mind. Overall a great place!