The walkability is awesome. If you live anywhere near downtown you can pretty easily walk to a ton of places that scratch different itches. I can go to Eastern Market, to a Smithsonian museum, to Nats Park, to U Street, etc just on foot pretty easily.

You can get around the downtown core even as a newcomer thanks to the basic organizational system of letters and numbers.

DC has enough to do to keep yourself entertained but not so much that it's overwhelming.