The early goal was basically a warning to Inter (and to be fair to every other team next season as well) that you can't just slow start or just have even 10 seconds where you are not careful, this team is so good, even one possession mistake will be turned into a goal. Not every team will take advantage of your every miss, they will miss themselves as well, not this team because if you make even one mistake, they are there to turn that into a goal.
I think after getting FA cup, the most important thing for City right now that they are about to win all the three big cups and that doesn't happen all that often, sure City wins the league pretty often, but not FA cup, and the fact that they have both of them this season is a proof that they will try their very best to get UCL as well, and they most certainly will.
Man City really wants this. They also have the confidence to back it up. Pep has also said it in an interview that they have to win the champions league. He said since people said they have to win the champions league first before they can be regarded as a great club, then he has no other option but to win it.
Whenever we see Man City in this confident mood, nothing stops them till they achieve what itvis they want to achieve. I feel the Champions league final is going to look somehow like the FA cup final. Inter Milan will put up a fight. They will be dominated and City would have majority of the possession but they won't make it easy for City. But eventually Man City is going to come out in top.
As far as I'm concerned Manchester City as treble winners.