Living in Makkah

You need to give us a bit more detail than that. How big is your family, housing etc.

Generally, Makkah is not laden with entertainment, but you are only 80kms away from Jeddah.

Thanks
I will be living alone
So looking for a furnished two bed apartment.
No idea about the good neighbourhoods

For a single person, 18K sounds good (not taking into consideration, your post or qualifications). Makkah may not be as expensive as Jeddah, but then again, I don't know much about living there. I go there almost every month, but just to the Grand Mosque and back. But from what I know, there are plenty of newly developed areas on the outskirts. Maybe someone else can shed some light here.