Our family has now stayed at the Old Town Hilton twice while visiting DC. This time we were able to come in by Amtrak and walk 5 minutes to the hotel. It is two minutes from the Metro (which will take you into the city for a few dollars without the need to park) so there was no need for our own vehicle, which saved time, money and stress. There are plenty of wonderful restaurants and shops within walking distance.
The only negative is that during a recent renovation they removed the indoor pool which our family had really enjoyed in the past.