You cannot beat this location. The best of what DC has to offer - all right outside the door. The metro (with three lines!) is across the street and will take you anywhere in the city, a quick walk to the National Mall, and the best of Capitol Hill/Eastern Market is all within a few blocks. This description may make it sound like this spot is in a noisy, crazy area but it is quite residential and a nice place to come back to for a breather after exploring all day.
The apartment is great and easy to stay for an extended period - all of the kitchen supplies you need, a nice bathroom, a table for working, and a private bedroom (with blackout shades!).
If you are traveling with a dog - there is a dog park a block away and the front yard is fenced in.
The apartment is stocked with guides, maps, and travel books so you can really get the most out of your stay. We were also able to use the parking pass!
Kelly checked in on us a few times throughout our stay to make sure we had everything we needed which was very nice. At one point we thought we may run low on toilet paper and within minutes there was more outside the door.
We were excited to find this spot with so many 5 star reviews and can confirm that each 5 star review is completely valid and earned by Kelly (and his great family!).
Don't think twice.