It's a lovely apartment with a very comfortable and big bed. Technically you dont book the "whole" apartment. What you essentially get is one of three decently big rooms with your own private kitchen and bathroom. It is one apartment, consisting out of three rooms, each booked by a different Airbnb-guest.
Keep in mind that the apartment is located in the town centre of Prague. Parking is ridiculously expensive so if you want to save money and arrive by car its best to park more outside and take the bus/underground etc.