I'm pretty neutral about Manchester City's chances of winning the Champions League title. It is unreasonable at this time to expect Manchester City to miss out on their first title although in most cases Pep Guardiola has not been able to prove that with any other team apart from only Barcelona. Pep Guardiola has to prove it that he can, and this season is the time to prove it.
Guardiola's main problem is actually about how he can spoil Inter's strategy which might try to defend well. It's not uncommon for Inter to play their tight defensive side when Guardiola and his team tend to dominate the game, it will be exciting to watch.
The game between Leverkusen and Roma in the Europa semifinals has shown that football sometimes can be unfair. The home team was totally in control of the game from the start to the finish but failed to produce a single goal. That win for Roma is an indication of how Italia football clubs can frustrate the effort of an attacking team. Mourinho's Roma defended from start to finish without making any costly mistakes.
Inter Milan can not be compared with Manchester City in terms of coordination, player quality, and technical acumen of the coaches but football can sometimes be partial. City might take charge of the entire game but Inter might just be lucky to get a goal and defend it with their lives. Remember City was able to identify the weakness of Real Madrid after the first leg. But this final is just one game, so any mistake will be costly.