I had a great visit to Washington DC mainly because of the wonderful place provided by Kerry-Ann & Steve. The place was very clean and well furnished.
I went to DC to see a concert at the 9:30 Club. This place is just a few blocks from the venue, very easy walking distance. It is also very close to Howard University Hospital and lots of great restaurants. The neighborhood is a vibrant collection of town homes, which recently have been updated and revitalized.
There are metro stops very close as well so you can get anywhere else in DC without any hassles. Although I did not use them, there were metro cards in the room which I assume you can load up with your own cash; which would save you a couple of dollars so you don't have to buy your own new card.