I really liked the job Roma did against Milan away as well. Actually I can't say Roma were the better playing side. Their performance wasn't that impressive in general but used their chances more efficiently. De Rossi has really made difference so far. I started to believe in Roma more to eliminate Milan now and I had a bet placed on their advancing to the semi finals.
I think it is very risk to bet on Roma to win the second leg, I only saw the highlights of the game, however, Roma won but Milan dominated the game and missed many chances to score. Milan has won both home and away games against Roma in Sería A competition. Though there have been many changes at the club since Danielle De Rossi's being appointed, I am still concerned about their next game, I do not believe Roma will advance to the next round because Milan are far better than them. Let's see what happens in the second leg this week.
The worst thing Atalanta can made in this next game is play defensive, because they dont know how to do it, and they work better with high pressure and attacking all the time, so i hope they dont fall back in the pitch so much, Liverpool is always a super team, and if they found a rapid goal that can change everything.
I don't think Atalanta will have a problem with their second leg game, Liverpool is already down with three goals, while Atalanta will host the second leg, which I believe will give them an advantage since they're playing at home. Liverpool are the best club in this competition, but their performance in their last game was poor, they looked like a weak team. Though you are correct that Atalanta must be careful and play defensively, Liverpool may surprise them at home as well, as they did when they defeated Sparta Prague in the round of 16 with a lot of goals. Atalanta shouldn't rest on Liverpool, so they can maintain the lead and qualify to the next round.