The Donovan House is quickly moving up my list of favorite hotels. It's location ( 12 minute walk to White House) is excellent, and the rooms are unique with great light and views. I've been in three rooms and all were well done and modern. Other reviews mention street noise. There is quite a bit (and some light noise as well) but not anything that detracts from sleep.
Beyond this, the service has been impeccable. There was a small glitch in my reservation, but Harold took care of it immediately and Dasiy was also helpful. If you have the time, also stop by their restaurant Zentan. Chef Jennifer works miracles with the menu and Joseph and Adrian made my meal the best in a long time!