If you want to visit Boston without the crowds and noise, this is the place for you. This was a great location about halfway between the Bunker Hill Memorial and the USS Constitution. The Freedom Trail path actually leads right to the front door! We loved the nice, quiet bedroom neighborhood, and we were very glad we chose Charlestown over downtown Boston.
The apartment is small but not cramped, thoughtfully decorated, and super-clean. It is a perfect Airbnb in that it feels like home without feeling like you are invading someone's home. Tall guests will appreciate the high ceilings and showerhead. The stairs to the roof deck are not for the claustrophobic, but the view is worth the climb, and it would be a great place to hang out in warmer weather.
Within 2-3 blocks are Legal Oysteria (good seafood), Figs (didn't get here), and Warren Tavern (french toast platter was sub-par, but their burgers are probably better). There is a Starbucks nearby also, but you should try Charlestown Tea and Treats for a more relaxed, local experience.
Last tip - the bedrooms get much warmer than the front room, so turn down the heat before going to sleep.