I also think they will win against Aston Villa. Because they played exceptionally against Liverpool and were very good in both games. I am sure they will show us two good games against Aston Villa. However, I am not sure about the semi-finals because the teams that made it to the semi-finals are not weak teams at all. I don't know how Paris Saint-Germain will play against them. However, their biggest chance is to have an experienced manager like Luis Enrique. He knows which player to play best in which position.
Looking at their form in the Champions League before, I am sure PSG can beat Aston Villa easily, but it takes a much better performance because we know how Premier League clubs can do everything. When facing Liverpool, PSG's ability and playing pattern were very good because it looked so impressive and we hope PSG can repeat this kind of game again when facing Aston Villa.
For the competition in Ligue 1, there may not be many problems so PSG can be much more focused on facing Aston Villa because if they do not prepare well, what happened to Real Madrid when facing Arsenal is not impossible for PSG to experience.