I have tried about 7 or 8 different hotels in DC, and the Park Hyatt is the best. Elegant, serene, understated. And incredible professional service. The door staff were particularly good - incredibly polite and extremely attentive. The restaurant were able to accomodate me at short notice even though they must have dreaded the thought of a single female. Very little to find fault. As other reviews have mentioned, the sound proofing could be a bit better, and possibly the addition of extra free weights in the fitness centre.