I didn't even know Aston villa played throughout fr, I was surprised to see them on the list after the recent round up. Hence, you don't seem to be following PSG games somehow recently because with what they show I don't think Aston villa stand a chance. Fine, Aston villa isn't a small team but they haven't been that stable , they haven’t been that much of a stable good performing club but for sure we could say things might be different because it's a very serious stage yet I still doubt they can take out PSG.
UCL football is very unique and entertaining, the best tournament in the European league. Don't classified any club that have reach this very phase in the UEFA Champions League as average club. They've been the very best teams and having some good time beating oppositions. Aston Villa facing Paris Saint-Germain is actually a tough one to consider, this fixture will keep most of us in suspense. Unai Emery wouldn't take things easy, he does know the perfect strategy to adapt that will become strongly challenging for Luis Enrique and his men.
Unai Emery has once coached in Spanish for Villarreal and I think some time played against Enrique when was still coaching Barcelona so he might be aware of this, but the thing is, there's are two different teams with different mentality and goal. PSG is more sophisticated than Aston Villa besides UCL football mostly favours the strongest teams that's why no small team has being able to win the Competition since the it's format was changed back in 1992.