The Polytechnic University of Catalonia has a wide variety of university degrees to choose from. My personal experience on the Castelldefels campus is the following:
If you study telecommunications, you will find many teachers who are passionate about their subjects, who will help you with whatever you need, yes, then your exams will not be easy since a minimum level is sought at the end of the course.
The campus is close to the beach, so it is nice to take a walk between subjects or to simply sunbathe while you study for your next exam.
The only drawback that the university has is its cafeteria, since there is only one on the entire campus and it is run by a private caterer, so the prices are set by them.