Italian coast is more difficult: There are the official Italian S-63 charts, but you will have to have a look at the coverage. Few large scale charts. Croatia has a good S-63 coverage.
Thank you everybody.
I think the best is to buy. Trying to find free charts for this region is just waist of time.
I found this site, ChartWorld - Shop
The search engine is a bit awkward.
Charts:
IT200435 - Adriatic Sea And Ionian Sea
HR200031 - Venezia - Zadar