Update 2021-03-31 (2): According to media reports on Wednesday (31 March), COVID-19 containment measures in Italy have been extended until 30 April.
Update 2021-03-31 (1): The Italian Embassy in Berlin provides an overview of the categories of travellers exempt from the current testing and quarantine regulations on its website. Details can be viewed at the link below (section 4).
Italian Embassy (Berlin)