Zaarath and Christopher Prokop -- and their two cats -- live in the smallest apartment in the city, a 175-square-foot "microstudio" in Morningside Heights that the couple bought three months ago for $150,000. At 14.9 feet long and 10 feet wide, it's about as narrow as a subway car and as claustrophobic as a jail cell. But to the Prokops, it's a castle.

Angel Chevrestt