Shkodran Mustafi netted a late equaliser to cancel out Koke’s opener and earn Valencia a deserved point in Madrid.
“We knew this was going to be a very difficult match against the defending La Liga champions in their stadium,” Nuno told the Spanish press. “This is a valuable point for us.
“I’m very satisfied with my team’s performance in the second half.
“We showed no fear after the re-start and my players went out with an exemplary attitude, determined to clinch a win.”
The outcome extended Valencia’s unbeaten run to five league games and left the Che outfit in fourth place, just one point behind Atletico, who are third.
Valencia have lost just one of their last 13 league games to maintain their push for Champions League football next season.
“We have the youngest squad in the league and we started a new project this season,” Nuno said. “To have come here and be competitive against Atletico is important.
“Like Atletico, we are fighting for the same aim, that is to play in the Champions League next season.
“We will not get sidetracked from our objective.
“This point makes us much stronger and means that with time, we can compete against the top rivals.”
Valencia have not lost at the Mestalla stadium since November 30 and host Deportivo La Coruna on Friday.