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I agree with the suggestion that Greenbelt is the best Metro station choice for people coming from PA/NJ/NY via Baltimore.
If coming from central or west PA via Frederick, MD, Shady Grove or Rockville Metro stations would be best.
From Western VA or most of WV, Vienna Metro station is best.
From central or southern VA, Franconia-Springfield Metro is a good choice, whereas Mt. Vernon or other east VA residents may consider Huntington Metro.
New Carollton, Largo, and Branch Ave Metro Stations are possible choices if coming from MD south of Baltimore.
Here is the Metro map: http://www.wmata.com/metrorail/systemmap.cfm
Bill, I recall staying at a Holiday Inn that had a Metro station within walking distance. I think it was in Springfield, Va.....can't remember Metro station.
My hubby and I are driving up from Florida. He doesn't want to drive into D.C. so we're looking for hotel outside but with easy access to Metro. Any suggestion would be appreciated. Thanks.