For the record, it is written Porto Comunale
Comunali is the plural of comunale, and yes, there are few Porti Comunali (noticed the plural?) which are not under any lucrative organization, but they are getting fewer and fewer, since they are finally realizing that boating can be a source of money.
As a matter of fact, many marinas are rising from the plans of architects. Nevertheless, they are built for big yachts and definitely non-working class gear. There is a rule in EU that (if I remeber well) a 10% of the available moorings in a marina has to be dedicated to transit vessels. However, this is quite seldom applied.
Italian seas are quite beautiful, folks, but try and dock your vessel at harbour only for a limited time. Bays and gulfs are quite better and more relaxing.