Check out this website to get the Crime Stats for Marshall Heights and other surrounding areas. Crime occurs throughout DC in all areas. http://map.data.dc.gov/
I don't live far from this area. I don't feel unsafe and my neighbors are nice. Here are some beautiful homes near me http://mrislistings.mris.com/DE.asp?k=3041248XKJ4T&p=DE-170161933-944 Call me at (202) 670-6677 if you are interested in seeing some places in my neighborhood.
Talk to you soon,