Defeating Rennes 3:1 at home I think was a good preparatory performance for Paris Saint Germaine who'll travel to London in the midweek to face English Premier League club Arsenal in the UEFA Champions League competition. Like you rightly said, Arsenal is a very strong team that's very capable of beating any of the top teams in Europe but I believe that Luis Enrique has all it takes to fight them.
Paris Saint Germaine have dominated the French league for far too long and must extend their dominance to Europe now before they can be considered as an European heavyweight. A win for the French champions at the Emirates will help improve the mentality and confidence of PSG but I strongly doubt they'll be able to beat Mikel Arteta's men.

Arsenal v Paris Saint-Germain: Dembele left at home by Enrique
France winger was substituted late in Friday night's win.
Source:
https://www.goal.com/en-in/lists/psg-star-ousmane-dembele-dropped-champions-league-arsenal-bust-up-manager-luis-enrique/blt65d5917554295630#csb99fc22d80a51b82This is just incredible, when PSG had a good squad, they did not have a good coach. And now when they have a good coach, the coach is not being able to bring in really good results because he does not have the quality of squad that Christophe Galtier had, lol
I think Luis Enrique is still bringing in good results, results which are much more consistent. The last match against Rennes was good for PSG. Even though I understand that Spanish tactician Luis Enrique is trying different things and it is working out for him and the club, I don’t think this is actually going to work out when they are going to play in the Champions League. if we talk about the French league, then I think Enrique is right and he will be able to win the league title without too much of a problem even though he does not have the superstars that PSG had a few seasons ago. Not having Mbappé is going to be the biggest problem for PSG when they are going to play in the Champions League. The strikers that PSG has right now are only good for the French league, not the Champions League. Now relation with Dembele seems not good to the coach, their performance will drop significantly next match against Arsenal I think.