The price is what catches the eye (it's great value), then perhaps the location (it's a bit out of the way) - but investigate further and you'll find one of the most interesting and unusual accommodation options in DC.
The IGH is run by Mennonites, a Christian group who advocate simple living and nonviolence. Though I share these convictions, I was a bit nervous about staying there as I'm not religious. I shouldn't have worried - my wife and I couldn't have hoped for a more welcoming place to stay on our honeymoon trip.
The place is scrupulously clean, the rooms are comfortable and (importantly in DC) air-conditioned, but it was the host couple and the volunteer staff who really made the visit an absolute joy. Everyone was so friendly and pleasant, and this mood seemed to pass on to the other guests, all of whom were fascinating people in their own right. Chats over breakfast and in the evening became highlights of our trip to Washington.
Let's be clear - if you want all-night partying or sybaritic luxury (nothing wrong with either, of course), this isn't the place for you. But if inexpensive, comfortable, wholesome-warm-welcoming tickles your fancy, this is a great option. Certainly I'd take this over a faceless Holiday Inn-clone stop every day of the week.
Oh, and I could start talking about the breakfast muffins and the home-baked cookies at evening tea - but I'll let you discover those yourself!