http://www.gallaudet.edu/x674.xml
Given that there is a free shuttle from the Metro, you can live along the Red, Blue or Orange line of the Metro.
DC is very expensive. Lots of single people live in / around Tenleytown, Woodley park and Dupont Circle in DC. Nicer neighborhoods are along Connecticut and Wisconsin Ave.
Others choose Silver Spring (red line).
I didn't know what you meant about open minded communities but culturally, Metro DC a diverse population of various ethnicities, educational backgrounds, physical and mental capacities and sexual orientation.