April O'Neil's first apartment (1987 TV series)

April's Apartment is where April O'Neil lives in New York City and where the turtles ocasionally hang out. It first appeared in A Thing About Rats

History
A Thing About Rats - The Splinter is attacked mousers inside the lair and the turtles take him to April's where she and Splinter use kitchen utensils to fight the mousers.

Trivia

 * The apartment number is 48
 * Some episodes show April has lots of cat pictures in her living room.