AFC Bournemouth led 1-0 at half time thanks to a Dean Huijsen goal, before a Justin Kluivert penalty and an Antoine Semenyo strike shortly after the hour mark put Bournemouth in control.
Reacting to the result, Iraola told the Daily Echo: “Obviously, we have to enjoy it.
“It doesn't happen a lot that you come to this kind of stadium and you win 3-0. I think the game was more level than it looked with 3-0. I think especially Kepa's performance has helped us to win like this.
“It's true that I think we finished very well the game, very strong, pushing them and making the play difficult.
“But I think the key moment was the end of the first half where we've had there, five, ten minutes against the wind that they had these corners, a free kick from Bruno.
“I remember a couple of shots from the outside where we were suffering a little bit this end of first half. And after half time I think we've started much stronger and in a better way.”
_(Image: Martin Rickett/PA Wire)_ On Huijsen’s headed goal in the first half, the boss said it is always valuable if you carry a threat from set pieces.
“I think we are quite a short team,” he said.
“We've normally exploited routines, but when we have Dean in the starting lineup, you always have this threat that is valuable and it has served us in very important goals against Tottenham the other day today the 1-0, that is always the most difficult goal, against United.
“I hope we can continue adding goals via set plays.”
The [Cherries](http://www.bournemouthecho.co.uk/sport/cherries/clubnews/) started the second period brightly and were rewarded with their quickfire double shortly after the hour mark.
Asked what his instructions were for his team after the break, Iraola said: “More than instructions, we have to value the players.
“At the end it’s an amazing play from Justin, amazing play from Dango \[Ouattara\], later for the other goal and for me it’s the players that make a difference and in this case, Dango, Justin, Antoine with the finish, I think they've been once, I think in a much more solid second half where they've given us the goals.”
_(Image: Martin Rickett/PA Wire)_ Semenyo’s goal was a good finish at the end of a flowing Bournemouth move, but Iraola was particularly pleased with the goal within the context of the game.
“Even when we were 3-0, you look at the still to play a lot of minutes and you are not safe, you don't feel safe,” he said.
“Because we know the threats that they have. In the second half, they had Hojlund, Garnacho, Amad, Bruno arriving from behind, they have threats and I could see that if they score within this stadium, the atmosphere that they create, and you don't want them to score just in case.”
But Bournemouth were able to keep the Red Devils at bay and secure another famous three points to move to fifth in the Premier League.