This place has an interesting story. For a long time, one of the two towers in the main KPI building was abandoned and not used by anyone. The entrance there was blocked. But then some active students organized and won a money prize for their project. The project was to renovate this place and make it open and available for the public. It took nearly a year to complete everything and since then this place is open (and quite popular among students).
Right now, this is used and operated by student organization as an art space and a small coworking area in the basement underneath the tower. Art events and exhibitions often take place in it (check their Facebook page). Most visitors who come here climb to the top of the tower. There you can go outside and see a great panoramic view of all the KPI campus and the nearby city. It is definitely a must-have if you are nearby.
Entrance is through the main building, then turn left and go straight till the end of the corridor. At the end, turn left again and you will face the stairs to the top :).