I'm Brazilian, I know him. He's not world class material IMO, but he is a young gifted and reliable defender.
He is tall, quick, tough, good antecipation skills. Left footed if I'm not wrong.
He's not a beast, but is the kind of guy who doesn't call attention, is not prone to mistake. Quite reliable.
8M is a good price for him. More than that I don't know. He's like a very improved left footed Bonucci.