I lived in Chevy Chase, MD and loved it. I could drop into Rock creek Park and be in Georgetown or Rockville in no time on the bike. From Georgetown I could jump over the river and ride into VA, and from Rockville I could pick up country roads and be in the open farmland with no hassle at all.
Plus, by bike or car it was five to ten minutes to WRAMC or Bethesda Naval Med Center.

On the Red Line Metro