For better orientation, see the information boards on the CZU premises. The university is located in one area, which means that all of the normally-scheduled classrooms can be found on the premises.
Each classroom has a specific numerical designation. Rooms that have numbers in Roman numerals (II, III, V, etc.) are lecture rooms and are mostly on the first floor of buildings. As for the other rooms, the first digit always shows the floor where the room is located.