Security in going to a WG appartment: about being robbed and/or assaulted.
If you do not speak Mandarin, you might feel unsure somewhere going more north than Prince Edwards,
you may not find easily someone who can explain the way in English there...
So I would recommend you stay more on the Hong Kong side, ei. Wan Chai or Central.
There you can find easily "appartments" in the DB and it is very safe, I never had a problem and reading here the forum,
no bigger issues have been reported. But do not expect a luxoious appartment and sometimes the entrance
may not be too clean or like a foyer of a hotel :-). But once you are in the appartment with the doors
to the rooms and you see the signs "Welcome" on the door, it is fine...