Guardiola joined City in the summer of 2016 and has gone on to win eight major trophies in his first four seasons in charge, playing a beguiling brand of football that has seen us set a series of impressive national records along the way.
And on Thursday, he put pen to paper on a new two-year contract on, keeping him at the Club until the summer of 2023.
Begiristain, who collected 22 caps for Spain during a distinguished playing career, says Guardiola has blended consistent results with beautiful football, hailing his hard work and tactical acumen.
“Pep took us – the Club – to the top level, the maximum you can get,” he said.
“He has been important because we wanted to play attractive football and to win. He has done both extremely well. We have played unbelievable football and we have won.
“He’s a hard worker. Everybody wants to do well and be successful, but he is a hard worker.
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“Everyone talks about the complexity of his tactics and that he’s always studying the opponent and his team - but it’s basically hours and hours of thinking and sharing with his staff.
"He spends a lot of hours here at this training centre, so the final product is on the pitch.”
There have been many highs during Pep’s tenure, with the team winning 181 of the 245 matches he’s overseen – a win rate of 73.87 percent – collecting a piece of silverware every 31 games.
From our Centurions campaign that saw us set a new record Premier League points total, to becoming the first team to win all four major English honours in a single season, it’s been a period of glittering success.
And for Begiristain, the 198 points City collected over two Premier League campaigns is something he never felt possible.
“For me, something unbelievable was to do two seasons winning 198 points,” he said.
“I could see he could do it [win titles] but I could not expect such a big amount of points.
“I told him once when he was in Germany and we were talking: how difficult it is in the Premier League. You can win the league with 85, 86, 87 points… but to get 198, even I had thought it was impossible, but he did it.”