late Thursday solo dinner near the W
I wouldn't necessarily describe everything on the menu as delicious, but Old Ebbitt Grill would be an option - open late and just up 15th St. Late night raw bar specials kick in at 11 and run till 1 am.
If you can get there before the kitchen closes at 10, Proof (near Verizon Center) is quite good.
I realize you said you don't want to do room service but since you are staying at the W you should be aware that there is an amazing sandwich apparently ONLY on their room service menu. This club sandwich sounds great! http://www.weeklystandard.com/blogs/c...
But if you really don't want room service there are other options. The Hamilton is right next to your hotel, open late and good.
Central is also a good option, as is Bibiana (a slightly farther walk).
All these places are good for a solo diner because you can sit at the bar and have a great meal.