I assume you mean the one up by the city wall. There were a lot of interesting ways to go, but difficult to see all the ins and outs and the many staircases up and down. I took a side trip up the spiral staircase in one of the wall towers to a lovely view up on top.
Yes, between 13-14 - although we did it in the opposite direction. We tried several different routes just to get the whole picture. And the view was fantastic.