Cluj-Napoca is a great city for students and has a lot to offer. It safe, slightly expensive and young. There are around 5 great universities you can choose from, with multiple programs and great teachers.
Take advantage of the possibilities they offer like Erasmus, Work and Travel, student’s organizations, Internships and friends. UBB is one of the best universities in the country and the knowledge you get is very good but a little superficial in some subjects.
Choose carefully what subjects you want to study and attend all courses in order to get the most out of it.