It is a large beautiful apartment.
Functions as a habitat.
Catherine Chandler's Apartment is located in New York City. While hiding out, Vincent Keller would hang out at the apartment very often. it has two bedrooms and two bathrooms, and is located on the fifth floor of the building, right below the roof.
Catherine used to share the apartment with her sister, Heather, until Heather moved to Miami. When Vincent was in hiding, he & Catherine spent a lot of time at the apartment, often on the fire escape near the bedroom or the roof. When they got engaged, Vincent moved into the apartment with Catherine.