describe your climate, where is north, where does the external door next to the bathroom go to, which direction does the block slope, what is the distance from the house to the boundaries in every direction? if the verandah is towards the view, is there a neighbour on that side and will their house be higher or lower? and please include plans for downstairs...

my suggestions are based on rearranging the stairs and optional upstairs laundry with the downstairs bedroom having a bathroom/laundry..rearranging the stairs improves furniture options and the ens and wiw have been rearranged for the bath to have end on view through an internal window low enough to see the view whne sitting in the bath..the original rumpus has been rearranged without hallway to make a more generous space and the upstairs laundry has access to the garden through the rumpus room...total floor area is about 75sqm downstairs and 186sqm upstairs (with the upstairs laundry and bigger rumpus) but excludes decks and most windows which should both be based on the view...the kitchen and pantry is generous with plenty of space for most combinations of appliances and the island has been arranged to face the view when seated...highlight window would avoid looking at the fence, create the best light. allow plenty of space for wall cabinets and there's the small window in the corner to encourage ventilation

Gas is for dinosaurs ;) I'd go an all electric house, electric oven, induction cooktop, RC A/C for heating/cooling (they are very energy efficient heaters), electric (or heat pump) hot water, bottle gas for the BBQ. Couple this with a large solar PV system (5kW inverter, 5-6kW panels) & you'll greatly reduce energy bills. Design your roof to accommodate this PV system (not a roof with a million little triangles).

If you're around the Central Coast, a well designed house should require little to no active heating/cooling. It's all about getting the orientation right, & letting the sun do it's work, heating your house in winter, & shading it in summer. My parents apartment in Sydney is designed this way. They never turn the heater on, & they use the AC a couple of times a year, for an hour or two in hot summer nights.

Designing with orientation in mind is called "passive solar design". More can be found here,

http://yourhome.gov.au/passive-design

Simply put, it's about locating your living areas to the north, where they will be heated by the sun in winter, & minimising western windows, which overheat a house on summer afternoons.

Unfortunately you have a northern frontage, which limits your scope to locate living areas facing north, but I'd still consider locating an additional living space to the north, in lieu of the master bed. I'd at least remove the northern portion of the verandah, as it will eliminate any winter sunshine from entering your home. An appropriate length eave, which admits winter sunshine, while shading summer sun, is a much better idea.

With an interesting roofline you could have north facing clerestory windows, which would allow northern sunshine deeper into your house.

Your other major concern would be west facing windows. West facing bedroom windows are a particularly bad idea, making bedrooms unbearably hot on summer evenings. So I'd consider flipping the back section of the house, locating the bedrooms on the eastern side. The bathroom would take the brunt of the western sun in summer. As would the rumpus, which is not ideal, but it's better than western bedrooms. Shade any western windows with vertical awnings, trees or use low-e glass.

I'd actually consider flipping the whole plan, also locating your living area & verandah in the west. This verandah will then shade your house from harsh afternoon sun. Of course other things must be considered. Views, privacy, access to cooling breezes, whether your outdoor living area will be comfortable to be used on hot summer evenings, just to name a few.