One Month Residency in Washington DC

Office at the Library of Congress in chage of the internship would be your best source of info. They must get this question a lot. There are furnished short-term apartments (e.g., corporate apartments) in the area. Lots of people work in DC on short term contracts, internships, etc. I stayed at the Oakwood Apartments in Southwest (not too far from the LOC) for a month or so several years ago.

I agree with reply # 1.
Also, you can put a message on the craigslist, under "sublet/temporary" and/or "housing wanted". With all the Smithsonian Museums on the Mall, the LoC, EPA, dept. of Agriculture, and the like all in the same area, it shouldn't be difficult to find a nice furnished studio or 1 bedroom apartment in Capitol Hill area...

Craigslist Washington DC

I just tried to have an idea:

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OP, you've gotten excellent advice from #1 and #2.

I certainly have.
Thanks for the help!

craigslist DC is the way to go.

I lived in DC from 2003-2006 and found my place on craigslist as well as subletted on Craigslist...not much use to you - but we had a great furnished place very near LOC so places do exist :)