From across the galaxy the "Force" calls them towards this covert location. Founded, by believers in the Jedi, and Masters willing to train from young to older in the ways of the light. The youngest are taught in the old way, as it is the best to hone their senses. As they get older its on the more intensive stance training, and sparring introduction.
Always being monitored for this is training after all, and a moment of anger must be taught to be dealt with before it becomes a step into the dark side. The is usually able to calm the incursion, and resume training momentarily. After this stage, it's time for the Padiwan's to approach a master asking for an opportunity to apprentice under them. Currently there are more students then masters, so as such many have to wait, and provide help elsewhere in the Citadel. They enlist in the protection of the facility, policing the station, and providing council to the citizens which continue to pour in. Jedi and protectors alike serve the Citadel, and the Jedi masters.
The city Citadel remains a hidden location, due to the many ships which have connected to it, giving it more of a dock or refueling hub. Combined with the defensive, and offensive turrets, shielding, the many ships offer their collective counter attack to any hostile intruders.
The oldest and wisest, Master Yin. A species closely related to that of Yoda, which instead of carnivores became vegetarians thought to bring them closer to nature, and the living force. Master Yin sits in meditation most the time peering outward for signs of danger.