Our stay at Charlotte's place was excellnt. Nice big room, clean, private, warm, everything you would want to have! It felt like home.
She also had a lot of brochures and books available for your use, even had metro cards and international phone cards!
Charlotte had a visitors booklet which had all the information you'd ever need during your stay there. eg. nice restaurants, public transportation, general tips... etc
She also let us use her kitchen which was really nice.
We would highly recommend you to staty here if you are in Washington DC.