Gorgeous name! Amedea sounds like the name of an ancient pagan goddess to me, perhaps because it reminds me a little of names like Athena and Artemis. Unlike the male version Amadeus, it doesn´t sound the least bit pretentious or dated to me, but it still might be a tough name to pull off.
Aw-maw-DAY-uh? or aw-MEE-dee-uh? or aw-meh-DEE-uh? I like the first and third options, but the second one has "media" in it which I don't like so much.