I would be surprised if they beat PSG. I know that they have been good and they tried to make it to the quarter-finals, but I don't see them making it to the semis. I rate Emery a lot and I believe he's a top manager, if anyone can do it then it's him but in this case, the quality of PSG is way more than that of Aston Villa. Also, Enrique is not a small coach, he's a good tactician too.
If the match was a single match then Aston Villa will have a better chance because they can defend well and score a goal and qualify but a two-legged tie makes things very difficult for them to qualify. PSG will make it to the semi-finals, but I don't know if they can win Madrid if Madrid qualifies.
It was almost impossible for PSG to win against Liverpool. Even after losing the first leg at home , none of us thought that psg would be able to qualify for the quarter-finals. This impossible task was made possible by PSG players with the help of Luis Enrique. Luis Enrique is very experienced in the champions league platform.
Since psghas won against a strong team like liverpool, Aston villa is not a difficult opponent for PSG at the moment. PSG players are in form and they are very confident. The road to qualifying for the semi-finals is relatively easy for PSG.