We figured we'd need to stay in Pisa for two or three nights because that would enable us to visit the Piazza dei Miracoli in the early morning and late evening, avoiding the crowds somewhat. We are interested in art and architecture; what I especially like in Italy are Romanesque church exteriors and late medieval/early Renaissance paintings and sculptures, so everything in the Field of Miracles is right up my alley, whether it leans or not.
As I did the research, the big surprise was how many, many other things there are for us to see and do in and near Pisa. Looking at videos, photos, and Google Street View, Pisa reminded me of other Italian cities that we have enjoyed, like Padua.
I know that Pisa south of the Arno was repeatedly bombed in WWII, destroying many of the medieval and Renaissance buildings. So, for this and maybe other reasons, Pisa is said not to be "picturesque." We've seen plenty of picturesque Italian towns, however, and actually like to see hardware stores and other non-tourist businesses, post-war buildings, university students, and even graffiti --- all signs that a town or city has a life of its own.
Has anyone stayed in and explored Pisa for 5 nights (or even more?) and did you enjoy it? Our trip is for 5 weeks, early September to mid-October.