I stayed at the JW Marriott (at 1331 Pennsylvania) from 8/25 - 8/27. It may have to do with the fact that I paid only $70 per night, but I really enjoyed the JW Marriott. Everything in the room was clean, and the staff was always respectful and nice to us. The hotel restaurant we ate at (1331) was great, and there's a Starbucks in the lobby, which may be a plus or minus, depending on who you ask. My only complaint would be that the gym/pool area was a bit grimy and didn't seem as roomy or as clean as it could have been. Oh, the decore was a bit cheesy, too, but I've come to expect that from the Marriotts in general. It was a classy kind of cheesy, though; I thought it worked pretty well, as long as you didn't scrutinize too much. The location was superb. We had very little time in DC, and one of the friends I stayed with is a huge sightseer type, so it was awesome that we were so close to everything. Overall, a great experience. I would definitely recommend the JW Marriott at 1331 Penn.