Location: Adelaide

My main concerns are as follows:

Master walk through robe walkway seems like a lot of wasted space.

Ensuite shower seems unnecessarily big.

Ensuite toilet: would it be better if it was on the opposite side?

Is the courtyard necessary? I understand it provides natural light but I’d rather have a skylight and not waste so much space?

Main bathroom: does the shower need to be so long?

Given that the rear of the block faces North, would it be better to have the alfresco on the east side of the block instead of blocking out the sun?

Master bedroom: is it big enough to fit a small “bar”? (Sink+bar fridge). If so where would be the best spot for it?

Garage: is 6.6m long enough to fit two cars??? 😵‍💫

Garage no it is a single. Need 10 for 2 small cars. Your main shower is a walk in shower for that size master it’s great but vanity too small.
What is the structure to right of alfresco. How does house sit on block are windows in right spot.
Lounge dining. Add furniture to see if your fireplace? is in right spot.

Will garage floor be level with house at doorway or need steps?

I would make the walk in robe narrower, shift the doors to the WIR and ensuite to the left, and put a linen/coat closet in the entrance hall. I agree you should add furniture to scale to the lounge/dining to make sure that space works. Otherwise, there's a lot I like about this plan.

Yes alfresco on the east or west.

maybe move the fire place to the northern wall, or western if alfresco is on eastern side.

Is this a 4 bedroom house or is one of those rooms along the hallway a lounge?

The room along the hallway that may be a separate living area with no doors, has the bathroom door opening directly opposite. Not a great feature to have. AND the rear open plan living area has space for dining plus two small sitting areas but with lots of windows (are they full length?) furnishing it will be difficult. You need to mock up some scale furniture and put it in the plan to make sure it functions the way you want it to be.

WIR master suite - more built in storage can be added or a small centre island storage added. ENSUITE shower is a good size, leave as is. ENSUITE toilet Gives room for standing and drying. INTERNAL courtyard space may be a planning requirement from council. This is a long skinny home and the length of walls are usually regulated by councils. This courtyard may be because it has to be that way to pass through planning. I would have some shading as this is on the west side of home. MAIN bathroom shower is a good size, leave as is. ALFRESCO side wall should be on the west side (as drawn on plans) to block hot summer sun. Do not have a solid roof, have a retractable roofing system or solid roof with a gable at the end to allow for northern sun into the home in the winter. GARAGE is only wide enough for one vehicle and long enough for one vehicle, not two. A single car and storage. BAR in the master. Locate top left hand corner. Or take room from your WIR on that side.

Laundry is a long way to walk to any decent space externally that would fit a clothesline. Maybe in the courtyard reduce the large sliding doors and have a tall skinny window to let light in and a separate hinged glass door, and this courtyard could become your clothes drying area. With this plan it has only bathroom windows looking onto it.

Can you show dimensions any clearer as unable to read them