We stayed at the Hilton Garden Inn and found it to be conveniently located near two malls and an easy metro ride into Washington, DC. The room was the standard Hilton room and had a nice glassed-in shower (though I found the shower floor to be a bit slippery).
The not-so-good: The woman working the front desk when I arrived was a bit short with me when I asked her if the shuttle could come pick me up at the metro (it was around 11am) - and this was after I had called twice and no one had answered after many rings (they answered the third time). I thought I had the wrong number! I think the hotel should consider having the calls routed to an automated system or something after a number of rings to let someone know that they are busy, but will be with them shortly.
The great: The rest of the front desk staff was wonderful. The brunch (though not included) was tasty - I liked the egg & cheese wrapped with salsa. The shuttle driver, Jose, was awesome. He was friendly, professional and seemed like an all-around good guy. He was never put out by driving someone or picking someone up. The rest of the staff was very friendly, as well.
In short, we would stay here again.