Welcome to Shepherdstown
The bulk of the best preservation can be found along (and within walking distance of) German St. The historic center is also close to Shepherd University; the student presence can be felt pretty strongly in town, but it's balanced out by plenty of pick-up-driving West Virginia locals.
The city is a good base for exploring Harpers Ferry, plus the Antietam National Battlefield just over the state line in Maryland. It's also a nice place to unwind after adventuring on the C&O towpath or the Potomac River.