TheFork users who ate in Santa Marinella have said really good things about Anema e Core da Rosa e Stefan, Tsade and Estro Ristorante. Maybe you should give them a try!
Some of the more popular Lactose intolerance restaurants that offer dairy free options on their menu in Santa Marinella according to TheFork users include:
Anema e Core da Rosa e Stefan, with a 9.2 rating
Tsade, with a 9.3 rating
Estro Ristorante, with a 9 rating