Hey there!
I think from what I can gather from the website that it's quite similar to a housing cooperative in the UK. People get employed to manage the area, helping the occupants (youths ranging between 16-24 yrs of age) to get the most out of the community.
Been trying to find out a bit more about the meal times etc, but it seems you'd have to apply for a room, or as a helper to get to this kind of information, as they don't seem to disclose it on the site!
Have a look at TYA's Accommodation article, it might give you some ideas of other possible routes, if you don't get through to UNHAJ or you don't think it's right for you.
Hope this helps!
