Sydney Accommodation for Family of 5

Hi all,

Taking MrsE and three kids (all under 10) up to Sydney for 9 nights in August/Sept. We would (preferably) like to stay in CBD, but accommodation prices are extortionate (even out of school holidays).

Have checked Airbnb (and Stayz, et al) but not much difference between costs there and proper hotels. Have considered YHA hostel but don't want to sleep in same room as kids (we love them, just not 24 hours a day!). From what I can see, Family room at YHA = all sleeping in same room.

So I am after helpful suggestions about any reasonably priced accom in CBD that fits the following guidelines:'

*2 Bedrooms (minimum)
*Walking distance to train station
*Ideally less than $200 per night (but can stretch up to $250 per night if necessary)

For the right property, we are happy to book two hotel rooms and stick the kids in the next room.

While I wouldn't mind staying in a suburb like North Sydney or even Mascot (given easy train access), CBD is preferred (if possible).