VŠB - Technical University of Ostrava is spread into several places. Main campus with student's dormitories is located in Poruba district.
Rooms in each location starts with different names, for example POREC2 means its in the main campus (POR).
Campus Poruba: POR
Dormitories in Poruba: KOL
You can find maps of different university locations here: Campus maps
You can use this map to try to find your classrooms.