City won thanks to Erling Haaland's goal on the day.
“Yeah, away game, you win 1-0, you suffer,” said Guardiola. “In the first half we were at the best we have been for many, many months, but we couldn’t score more goals which would have made the game a bit easier.
“We knew at half-time they would push more because the Premier League and everything is like that.
“They played more long balls and the wind and it was much harder and the long throws - that guy, I don’t know how he is (able to do that) and the corners we suffer, but the game was well played and we defend well because they didn’t create much chances.
“In the first half we created almost clear chances - a bit like in midweek against Monaco.
“I’m pleased for this month and we are there and we are getting better and better, game by game.”
Haaland and Donnarumma outstanding
On matchwinner Haaland, he said: “I said one month ago he is the best and that year we won the Treble, I don’t know how many goals he scored - maybe 50 million goals.
“But now he sign a contract for many years - we have to find him more, but he is more involved in the game, not just in the finishing, he is more on the ball and he work a lot his ethic, pressing and I am really pleased and I hope this week with Norway he can score more and come back fit for the Everton game.”
Meanwhile, goalkeeper Gigio Donnarumma was impressive between the posts for City and Guardiola also said: “He played a high level very young - he was 17 when he first played for the national team.
“Now he is 26 and he looks like he has been playing for centuries.
“His composure and presence - and the keepers in the big clubs have to save a few chances when you are playing good.
“Normally at clubs who played good, you don’t concede much but in this action, he had to save it and he did it today.
“The action was clear, we made a mistake and it was 1v1 and against a team who play long balls, thrown ins, Gigi is there and that helps us a lot.”