One serious note on "walkability." Columbus obviously has areas like German Village, the Short North, Italian Village, Victorian Village that are the traditional walkable urban neighborhoods that people point to with restaurants, activites, etc.
But for all the knocking of suburbs many of them in the past 10-20 years have developed nice, charming little downtowns that also are walkable and lined with restaurants, breweries, patios, fountains, etc. I'd wager more suburbs have that element than don't — Grandview, Grove City, Hilliard, Dublin, Westerville, Gahanna, Canal Winchester, Bexley, New Albany, Delaware, etc. — each of those have nice, central hubs.
People like to knock Columbus for sprawl and housing developments and strip malls — and that's all there too — but reducing the region to there's only the Short North, Bridge Park and 100-home subdivisions each with their own McDonald's and Applebees misses a lot of good stuff in between. A lot of stuff that people genuinely enjoy, which is part of the reason the region continues to grow.