The Reds welcomed fans back to Anfield for the first time since early March with a ruthless performance against Nuno Espírito Santo’s men.
Goals from Mohamed Salah, Georginio Wijnaldum, Joel Matip and Nelson Semedo's own goal were enough to seal an emphatic win for the Premier League champions.
Liverpool move level on points with Tottenham Hotspur, who also beat Arsenal on Sunday, at the top of the table.
"Wasn't it the perfect night?,” Klopp asked the reporter after the game.
“Imagine 10 months ago people would have told us we would have a game and 2,000 people would turn up. When we came out we all had goosebumps. I had no idea how it would feel. It was perfect. The noise, what the people did, they were on their toes you could see and feel and smell. They had waited so long for it.
"It is so much more enjoyable with people involved."
He added: "Having people inside the stadium, hopefully we can build on that as a society, not just a football society.
“As long as nobody tells me someone was injured then it's been a perfect night. Getting out of the dressing room for the warm-up, that was a proper goosebump moment."
Having already qualified for the next stage of the Champions League, Liverpool will be facing Danish side FC Midtjylland in their last group stage game on Wednesday.
