Bayern vs Bayer, Real vs Atletico, definitely good draws there, didn't expected same nations to happen twice. Also, PSG vs Liverpool will be fun, nobody expects PSG to be great, but Liverpool finished first place, whereas PSG scored 7 goals against Brest for a while, that has to be the most important showcase for them, they tried their best and did so great.
In the end, we should be considering how PSG could still manage to beat Liverpool, sure it is not simple, but it is not impossible neither, we could see this happen. If that could be the case, then we are going to end up with a great series even if it doesn't happen, if it is not a dominant performance by Liverpool and looks close enough, that would be fun for sure.
And don't forget Barcelona vs Benfica which is no less exciting than other teams because when these 2 teams meet there is always a rain of goals that will certainly entertain us as spectators. PSG once again showed a good performance, Enrique tried to change the paradigm of his players to create extraordinary stability. But Liverpool still excels and this is a match I look forward to. The Madrid Derby and Bayern vs Leverkusen should not meet in the last 16 considering that each comes from the same League.
I don't think this game will be hard for Barcelona to win to prepare for the next game, because Barcelona coach will not use anyhow players to play this game, and he need to apply all the strategies that will help the team to win this game to achieve 3 points from Benfica to stand in a chance to be among the team that will drag the trophy.
PSG has players that will change this game for their favour because they have talented players that will mark Liverpool players not to play well from the game, and even though Liverpool struggle to secure goals from this game, it will still end up for the favour of PSG because they have players that have long strength to finish every game well without reducing their strength for their opponent, which they will surely employ such strength in this game.