Myway, I have a few friends that are grade 9 and I will answer based on what I know of their terms & conditions.
Your Grade 9 package is very dependant on what the job is. I would be surprised if a "core G9" position gets as much as 18,000 pcm. I would have thought it would be nearer to 14K. By a Core G9 position I mean a HR person or some other middle management position. In Flight Services (Cabin crew) generally get more than a core G9 position and Flight Crew Training Instructors get roughly the same basic as a First Officer (18K).
As to accommodation, if you are single or married without kids, you will almost certainly get offered a apartment. These are to a good standard usually, however you cannot guarantee location or quality. The accommodation department will dump you where they have availability and sometimes it can be really quite bad. You have little or no influence on this.
DO NOT think about finding your own accommodation, you WILL regret that.
All in all, a G9 position can be OK, but you will have to learn the company way of doing things, don't rock the boat, don't expect to or try and improve things, expect to be managed by a totally unsuitable person and treated like you are disposable.
However, if you can play the game (embrace the organisations psycopathic treatment off staff and cut costs at every corner) expect rapid promotion to SVP level
