I live in DBay, and from your requirements, I suggest you go to a property agent, and fast. I can recommend Century 21 Newcourt Realty. Email:
discobay@netvigator.com, or phone 2987 9729.
I don't know of many four bedroom flats, but the few I see listed are about 14-15Million, and rentals are going to cost around $60K month.
Others on here will have more details.
Good luck.