If charm per square inch was quantifiable, this place would be off the charts. The tiny one-bedroom apartment not only has its wood-burning fireplace, numbered built-ins, and oak floors working for it, but it’s also hidden from the street and opens onto a lovely planted courtyard (h/t 6sqft). As if that all isn’t enough, the apartment on West 11th Street between Greenwich and Washington streets is asking a similarly wee $625,000.