I cannot overstate how impressed I was watching Darmian live. The guy did not stop running for a second, and was calm and collected in every situation he found himself in.
Other than that, Perisic and Hakan were also excellent. Ranocchia was a monster against Osihmen, actually thought he suffered against Petagna a bit more and then Mertens had basically free reign, what a player he is.
Just to echo what thatdude said, Anguissa was shockingly good. Watching him fashion that chance for Mertens at the end was both stunning and horrifying.
And finally, Barella is not allowed to come off the pitch, ever. Ever.