I would do a posting on Craigslist asking for a short term furnished rental and try to find a friend in DC to go by to see the home and then verify that the landlord actually owns the property. There will be George Washington University students trying to sublet their apartments for the summer. In addition there are a few furnished properties nearby which are listed for rent that I will be glad to send to you. Good luck - and welcome to Washington. You will have a great summer. Feel free to shoot me an email if you want a relocation package to help get settled into DC. It is filled with restaurant suggestions, information about nightlife, museums, outdoor recreation, and other things that you might like to enjoy!