If you are interested in commuting via public transportation:

The Metro is very convenient if your class is at the Foggy Bottom campus of GW. The Foggy Bottom station is pretty much in the middle of the school.

Arlington is right across the street from the Rosslyn stop. The HRCC is about a 10 minute walk to the Crystal City stop (or the Hyatt shuttle bus can take you there every half hour).

Both are pleasant, though nothing extra special. The CC is a little bigger with larger public areas.