A "city apartment" refers to a residential unit, typically located in a crowded urban area or city. It is a type of living space within a building or complex that provides housing for individuals or families in cities.
Because they are of medium size, they can live comfortably in city apartments (with proper exercise, of course) or large country homes. (essfta.org)
Instead, she travelled across the country renting city apartments for a few days where she would spend time with her clients. (nigeriapoliticsonline.com)
You're visiting a friend who lives on the 20th floor of an old inner - city apartment building. (scientificamerican.com)