I was impressed by Elson Luxury Suites. I didn't expect too much, as it was one of the less expensive properties in the downtown DC area - not cheap, but very reasonable, relatively speaking.
The suite was huge - a large, comfortable living room greeted us when we came in the door, much bigger than in a standard hotel. It was just a little bit old-fashioned, but we are very comfortable with that. The kitchen, although not so large, was complete with dishwasher, sink, coffee maker and full-sized refrigerator and stove, big enough for two people at once to cook together, but not a whole family at the same time. The sofa was comfortable and could provide an extra sleeping spot if more of our family had traveled with us.
The large living room chair was less comfortable, according to my husband - who then proceeded to sleep in it for about two and a half hours, so it can't have been too uncomfortable!
A full sized bedroom provided us with a good night's sleep, so it wasn't too difficult to get up at 5:10 to catch our 7:20 am morning train.
I was a little concerned that the light shining through the translucent bathroom and bedroom doors would make it harder to sleep, but this caused no problem - it was just bright enough to find our way to the restroom before the sun came up, without being able to see through the doors or to be kept awake by the light.
It was pleasant, large and comfortable, with everything we needed, and we would enjoy staying a week to sightsee in DC.