Prosecutors are seeking a four-year jail term for Jawad Bendaoud, though more serious terrorism charges have been dropped after they said there was insufficient evidence that he knew the men were attackers.
The court has been packed for the first trial connected to France's worst attacks since World War II, which started days before a separate case in Belgium involving Salah Abdeslam, believed to be the only surviving gunman from the Paris atrocity.
Bendaoud, a 31-year-old drug dealer, became a national laughing stock after an infamous TV interview in which he insisted that nothing about the men had seemed suspicious.
Abaaoud and an accomplice, Chakib Akrouh, hid out and plotted a fresh attack before they were killed in a dramatic police raid at the apartment on November 18, 2015, five days after the Paris carnage.
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Bendaoud has been on trial since January 24 along with another known criminal, Mohamed Soumah, who helped arrange the apartment but also claimed he did not know the men were terror suspects.
But they are seeking a five-year sentence for a third man, Youssef Ait Boulahcen, for failing to alert authorities about a terror plot.
He is "someone who believed completely in the ideology of Islamic State", the prosecutor said.
Ait Boulahcen is the brother of a woman killed along with the IS jihadists in the dramatic police raid at the apartment.
Bendaoud has put on a show for the courtroom throughout the three-week trial with a series of comic outbursts and one-liners which families of the victims have found distressing.