The question is too subjective for anyone to answer for you, but I recommend you make your own decision by tapping into a number of resources.
1. As Lisa mentions, the local police are a good resource. In Sterling that is the Loudoun County Sherriffs office, but in Leesburg (where this property is) it would be the Leesburg Town Police. I'd open the dialog by asking if there is an active neighborhood watch in the area where the property is and then asking if you can get copies of the notes from those meetings.
2. Both police departments report to crimereports.com so I recommend checking out that site.
3. Also, when visiting, look at the area... are people hanging out in street corners, what do the cars look like, do you see overcrowding, trash in the street, etc? Talk to neighbors. You'd be surprised just how much looking at those things will tell you.
4. This property doesn't have an HOA with a web site, but many do - check those and see if you can find copies of recent meeting minutes and/or call the management office and request that information.
I hope these suggestions are helpful. If you need more assistance please feel free to contact me directly ~ 703-669-3142 or MyAgentVicky@GMail.com