Better be discreet, otherwise they will throw you overboard if you consume your foreign instant coffee instead of their Italian coffee 😄
A cup of paid coffee is affordable 2,40 EUR. The free coffee (free for all at the self-service buffet, free for some at the MDR) will probably not satisfy you. But it is ok, the usual quality from hotel breakfast.
Tea selection is wide, I see no reason to complain, but I am a coffee drinker.