The Argentinian trainer was pleased to see his side progress in the cup but admits the scoreline does not reflect the manner of the game
The capital club ran out comfortable 3-0 winners at the Nuevo La Victoria, but concedes his side were pushed all the way, despite the Segunda Division side going down to 10 men early on.
The two teams will meet again at the end of November for the second leg of the tie, and the Argentine is aware of the threat their opponents will pose.
"Jaen created many problems for us in the beginning of each half, as they played decisively and have good players," he said in the post-match press conference.
"They are an opponent I already knew quite well, and this game was as easy as it seems when looking at the result."
Simeono also stated that he was not in a position to judge the referee's decision to send off a Jaen player in the first half.
"I was far from [the incident], I didn't see it properly, but we all have to respect the referee's decision."