My Latin isn't up to much, but hey..
If your text is aimed at younger people then Upper Room might be better than 'cenacle', which you don't hear too often these days! If I remember rightly, the 'Upper Room' was where they hid out.


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Note added at 13 mins (2004-05-28 17:55:02 GMT)
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The house where the disciples met after the Crucifixion claims, therefore, for its site precisely that part of the city where we should expect to find the house of the Upper Room. Moreover, the place where they met is called an \"upper\" room. Luke, indeed calls it \"the upper room\"—an indication that it was familiarly known as such in the early Church, and in designating it so (Acts i.13), Luke at the same time informs us it was the place \"where the disciples were residing.\" The seclusion of the place—on the outskirts of the city—would attract them, too; for they were afraid of the men who had crucified their Master, and met at first behind locked doors (John xx.19).



Surely it is a sacred place in Christian history; the scene of the Last Supper the night before the Cross; the disciples\' hiding-place after what must have seemed to them the great disaster; the scene of their mourning; the place where their sorrow gave way to a mysterious and startling sense [that the Spirit of their crucified Lord was present—that His personality had victoriously survived the rude rending of the casket of the flesh; the room to which they and other friends resorted for those days of intense and eager prayer ; the room where, after six or seven weeks, the Divine Spirit somehow rushed upon them, seized them, roused them to an extra­ordinary fervour and enthusiasm—the first appear­ance of that phenomenon which the Christian Church has grown familiar with in every great revival; the birthplace of the Church of Christ.

from http://www.katapi.org.uk/NTHiddenR/II.htm

This is the name given to the “upper room” where the Last Supper took place. It is Latin and means eating room (which was usually in the upper storey of a house)and derives from Coena [dinner].