With its three-level silhouette and pretty stained-glass windows, this hundred-year-old house resembles its Cambridge, Massachusetts, counterparts, at least on the outside. The interior, however, is unabashedly twenty-first century. The owners spied the potential on their first visit. “We were living in New York City, but were thinking about how nice a house with a yard would be. We saw the place on a beautiful fall day and that was it,” recalls the wife.