-Because The University Of Coimbra is one of the oldest universities operating. It not only makes Coimbra an ultra-cosmopolitan town but also the one with the youngest population and thus very happening. It has the reputation of hosting some of the biggest student parties globally.
A town further north of Porto, at about an hour distance is well connected by train as well as bus. Lovely city center and an even lovelier church sitting atop a hill in the outskirts of the town. Take a bus from the city center to Bom Jesus do Monte church. You would have to climb a few steps covered with bright green moss but you’d see, it’s totally worth it.