I had an opportunity to thoroughly visit this pleasant little University town in September 2019 beacause of the conference organized by KU Leuven (KU = Catholic University). Thus, I could explore the buildings belonging to KU located in the town center quite intensively. As the University is an inseparable part of Leuven, there are a lot of buildings used by KU scattered all around Leuven. While most of the lectures took place in modern buildings - the largest was Pieter de Somer Aula, we had opportunity to visit also huge late gothic University Hall during poster sessions. The Hall is located very close to Oude Markt (PHOTO - the building with tall roof on the right side belongs to KU and it is adjacent to University Hall, and in the middle one can see the Belfry of Leuven - WHS!!!) and also to the world-famous Town Hall. Unfortunately, I could see the impresive Library only from outside - the building is really expansive and it is hard to believe that it is really a library.
Even though Leuven is nice and worth-visiting, I cannot see any OUV in its University. No building belonging to the University is truly exceptional, and I mean not only old buildings but also modern ones. Furthermore, there are already two other WHS in Leuven! The University town of Leuven lacks the monumentality of WHS Coimbra and the spirit/integrity of still-not-inscribed Cambridge&Oxford, and does not stand out when compared to other University towns in Europe like Gottingen, Tubingen, Lund, etc etc. Even the famous Town Hall is not such exceptional when compared to other similar buildings in Belgium such as much bigger structure in Brussels (WHS already).