Dennis was a life-saver when i was stuck in Washington during Cherry Blossom season and the world bank annual meetings with a messed up hotel booking. He accepted my booking within a minute and even drove me to the metro station to allow me to make my business dinner on time.
Information was all correct and apartment was easy to get. Very good value in downtown Washington.
Be aware that the walls are not as soundproof as they may be in big hotels - guest and host need to be considerate with each other (I hope Dennis felt i was...)