Statistically they look the same, so this is really not an easy match for them. Both Chelsea and Manchester City need a win to maintain their position. But in terms of appearance, they can also be said to be the same when we look at their statistics in the English League this season.
However, Manchester City has another advantage, yes they will play as hosts and usually the team that plays as hosts is more favored to win the match. On the other hand, they also have to play a match in the Champions League first which will be very draining.
And after seeing this match, I even became quite doubtful about Man City playing against Chelsea. Chelsea basically has a pretty good performance this season. But facing Man City will still be difficult for Chelsea. Because Man City will also be the host of the match this week. And being a host is sometimes quite profitable.
During their crisis in this season, Manchester City already had many disappointed matches at their home stadium with support from their fans. Facing Chelsea at their home stadium, is an advantage for Manchester City players, but it's not a guarantee for them to win this match. They must fight and win it with players on field, with tactic from the head coach and support from fans are only supplementary things.