Here's what the USF guide to living off campus has to say on the nature of apartments in The City:

Flat

an entire floor in an older building with a private entrance

Apartment

several units on the same floor with a common entrance

Jr. One-Bedroom Apartment

studio apartment with a sleeping alcove

Garden or In-law Apartment

often a small one-bedroom unit, located on the ground floor of a small apartment building or single-family home; unit could face a garden.

Studio Apartment

a three-room unit consisting of a combined living room and bedroom, a kitchen, and a bathroom.

Efficiency Apartment

smaller than a studio; kitchen usually is very small or part of the combined living area.