Top spot in DC
Stayed at the Jefferson for 3 nights in a king size deluxe room. One of the most comfortable beds ever ! Would recommend this hotel to anyone who is a bit jaded by the Chains as it is a DC sight to see itself, especially if US history is an interest.
The biggest asset to the hotel has to be its Concierge team, headed by the wonderful Chris Adcock. Nothing is too much trouble for Chris & he really goes that extra mile to assist guests. 
Not knowing the area we had our night caps in Quill which offers a lovely all day menu & great nibbles. My review of Plume will follow ( & yes, it was worth it ). We found all staff to be very friendly. The room & all areas of the hotel we used were spotless and regularly serviced. In a good location half a miles walk from the White House it is also a short distance from Dupont Circle for Sightseeing bus & metro links.
We had a slight foible with the bill that was quickly settled, but it is certainly worth the 5 stars.