After a recent experience in an Executive Suite at the Willard Intercontinental, I would have to put that hotel on any Luxury list for D.C. Especially due to its location across from Treasury and the White House, and its rich and long history. The Round Robin bar is full of D.C. power brokers at happy hour and each morning I went down for the excellent breakfast I saw senior Congresspeople and White House staff having their power breakfasts.
My suite was massive and very well appointed with a full parlour and mini-kitchen on the side. They also have several very high end suites. I was offered an upsell to the Lincoln suite, but declined. Every President-Elect used to spend a month or so at this hotel during the change-over up til more recent years when security probably prevented the custom from continuing. The health club facilities too were Luxury level. ^