To me ancient Greek sounds REALLY weird. It has sounds that don't exist in modern Greek, like ü and ō, and I find it very funny, being a speaker of Modern Greek. But oh well, the present pronunciation has been around for 2000 years, so yeah...
But Greek sounds very different from all the other languages of the Balkans (Macedonian, Bulgarian, Serbian, Albanian etc).
Mother Tongues: Ελληνικά (Modern), English
Basic: Español, Ἑλληνικά (Ancient)
Wants to learn: Deutsch, Dansk, Svenska, Lingua Latina, Íslenska
Conlang: Vǿrliſë Loreéllë Atário (New Atario Language)