Generally a right winger, and more of a general creative midfielder, Centre mid would be his second position. However i think if his game continues to improve he will be moved to the centre or in the hole to allow him to influence the game as much as possible a la Gerrard at the start of his career. My brother in law was friendly with him when he was at Hamilton and still chats to him he said Liverpool was his dream move but he didn't want to move somewhere to be benched when he was playing regularly with Hamilton (which is wat Martinez promised him).
I think hes exactly what we need against a stubborn defense when brute force and ignorance isnt working, especially when hes suppling clever players like Suarez and Carrol. And he is the type of budding talent Liverpool should be in for as we've been caught napping or being stingy too many times in the past - Walcott, Rodwell, Rooney, Ronaldo, Alves etc