We stayed at the Grand over Memorial day weekend and found it quite nice. It was much improved over when I had stayed there a few years back. It is also very conveniently located right on top of Metro Center and a short walk from Chinatown, etc. My other favorite property in the area is the Arlington/Rosslyn Hyatt (NOT Crystal City). The Rosslyn property is sort of boutique-y and very friendly. It's a smaller hotel and is right around the corner from the Rosslyn Metro and close to things to do in North Arlington like the Courthouse and Clarendon neighborhoods.