Instituto Superior Técnico

If you are looking for a university for an erasmus exchange in Computer Science I would stay away. Absolutely 0 organization, huge workloads with no real benefit(I have taken 9 classes by now and I do not have 1 project that is worthy of being in my portfolio), professors make it very hard to pass classes just for the sake of it(Some courses are passed by less than 60% of the students because they have material worth much more than 6ECTS points). They love theory and math concepts much more than practice and developing software. Also if you plan to work and study, the only way to manage that is to benefit from working student status and pass courses in the special season, but for most erasmus students its useless as you are not staying for the summer. For some reason they think they are some kind of a portuguese MIT, while being a mediocre university that makes students' lives hell to create an illusion.