The apartment is on a lovely, quiet residential street with loads of character. It is nice and cosy inside and the facilities are good.
What really makes this place so good is the location - a minute's walk from the heart of 14th Street in the Logan district, near a plethora of excellent bars and restaurants.
DC's main tourist attractions are also walkable in a reasonable amount of time.
If you have a car, be aware that you'll have to either pay for private parking or be clever about the times when you park outside the apartment, as there is a two hour limit.
Finally, Susan was a delight to have as our host - very proactive with suggestions, wanted to ensure that we were having a good time and found everything ok, and offered plenty suggestions of places to eat/drink. One of the best places we've stayed on AirBnB.