My wife and I stayed in room 435 with windows facing the Park Hyatt on 24th St NW. The room was absolutely quiet and the view was generally nice for the 4th floor. The hotel location is really good since it's about a 3/4 of a mile walk to the White House and another 3/4 of a mile walk in the opposite direction to Georgetown. You get the best of both between sightseeing on the former and shopping and restaurants on the latter.
The hotel rooms are VERY expensive but everything is perfectly clean and well taken care of. We didn't eat at the hotel restaurant just because of price, but fortunately there were other options close by.
Hotel parking is Valet only at $45 per night. I believe this is just a little more expensive than other options around the city. Street parking is available in the area if you can find it.
It's probably more of a personal thing, but neither of us liked the pillows. They're just too soft. Maybe the hotel offers other pillows? We did not ask since we were there for just one night.
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