The on-loan Tottenham midfielder made his Villa debut in victory over Norwich City.
He told Villa's website: "Gabby was on fire. When he's in that type of mood and that form - which he's been in for several weeks - he's simply unplayable.
"He's strong, he's quick and I don't think there's a centre-half in the country who wants to play against him at the moment.
"Darren was great as well. He is one of those players who knows where to be at the right time. It's as simple as that.
"He makes good runs and when he's in with a chance of scoring, he's lethal.
"He's shown that again - two poacher's goals in the six yard box. It was exactly what we need."