The old town is relatively a larger area and to walk around it takes time. That's why apart from taxi, smaller colectivos operate in the area.
And at some part of the town you also find the imposing structure of modern highrise. But these establishment are usually built / rebult at the edge of the old town,.
The old town has also its share on narrower stoned streets built on the hill with preserved colonial houses.
The old town does not have many plaza or square in it. But here one I found while walking around in the morning and it seems like this is preserved and lead to the narrower streets of the old town.
There are several public and private universities inside the old town area which gives it a feel of of student area. The picture shows one of them.