You’re shower space seems narrow ie less than 900mm wide?? There are great new instantaneous hot water systems that can fit on outside wall too so free up internal space Have you gone to a bathroom place ? Some have specialist bathroom designers. So knocking down storage cupboard wall sounds good and have awning window above laundry bench and I’d prob integrate laundry into bathroom or perhaps could have bifold doors in front if want to shut off mess from any visitors and vanity can stick out more ie be deeper so have more storage else keep narrow and narrow full length wall cupboards on back wall. Play with boxes to work out how far things can stick out without interfering with the flow of movement you like

I think it certainly makes sense in the kitchen and laundry as one flows into the other and there is no reason why you can’t use the same in the bathroom. It will be more cohesive. You could get away with having different tiles in the bathroom if you prefer though. It also depends upping what wall tiles you want to use.

designers need floor plan to post their suggestion..

Is this to be a rental for ever, or are you going to move into home at some stage? Doing any changes at all with a rental is not cost effective. If the kitchen and bathroom is clean and fresh with no working issues, this would be fine for a rental. You may not like the bathroom position, but if your rental price is correct for this market then potential tenants will not worry. Have a conversation with your local real estate agents, to get more informed about the demographic and what they expect.