It's all about the metro to the game.
I went last year and stayed at the Capital Inn.
Holiday Inn Capitol, Washington, DC Hotels : Reviews of Holiday Inn Capitol - Yahoo! Travel
They have a nice bar with live music on the weekends and a decent restaurant.
Most importantly, It's a block from the metro and not in a ghetto.
If you've never been to DC, It's all about the metro.
Washington Metropolitan Area Transit Authority