The Spaniard has signed a new contract with City, which will keep him at the club for another two seasons.
The 49-year-old was also wanted back at Barcelona by certain presidential candidates.
"There were offers from Juventus, Paris St-Germain and others, but he's happy," said Spanish football writer Balague.
"He's enjoying himself, he's surrounded by people he trusts, he controls the sporting decisions and is happy that nothing that happens in the changing room comes out, which used to happen at Bayern and Barcelona."
"We all knew that Manchester City had put a deal on the table - the length of it we did not know - and City were not going to put any kind of pressure on him," added Balague.
"In the last couple of months, there have been stories about unrest in the camp, players' agents knocking on doors to see what's going on, just because they didn't know if Guardiola was going to stay on.
"Most of the transition is done, but there is more to do. He feels there is room for improvement and it needed him in charge of it."