My teenage daughter and I stayed here on a visit to DC and I can't say enough about this Hampton Inn. The facility is very clean and I love the location. Easy access to I-395 and the Capitol Mall, as well as to many eating establishments, grocery store and Target (in walking distance).
Free parking and free shuttle service to the Metro at King Street. The shuttle takes about 20 minutes to get from the hotel to the Metro. They leave every 30 minutes. In the morning you need to stop by the front desk about 30 minutes before departure to get a boarding pass since it is fairly busy. The Metro cost is about $4.50 per person to get to the Smithsonian stop during peak times and you do make one change of trains at LeFont station. The last shuttle to the hotel runs at 9:30pm but taxis readily available at the King Street Station and it cost about $15 for two passengers to get to the hotel.
Beware of the schedule of the home games for the Nationals while visiting since the Metro gets very crowded when you are leaving the DC area.
I can't wait to stay here again.