Just a few thoughts from my recent kitchen experience. I was told by Laminex that I couldn't do a handless kitchen with their product. Also the kitchen guy didn't like the idea of a handless cabinet with a integrated DW. He said that the force from the pull to open it can be damaging or something... I kind of glazed over after I realised the DW I had ordered wasn't going to work like I hoped and would need a handle on the panel (I ended up changing it for a semi integrated model). I had a drop in sink in my last kitchen, it was sort of flattish trim where it sat over the benchtop. I found that because it was flat I would end up with a lot more water splashing over the bench. Or maybe that just me. Good luck!

first decide how much counter is needed and if you prefer surface mounted or drop in sink...we chose the smallest drop in sink because it allows for generous counter space and because they're so comfortable to use they looks perfect

as a buyer i would be looking for a spacious uncluttered looking ensuite not twin basins squeezed into a small vanity..imo the counter isn't for storage itá place to rest a glass, dryer, toothbrush or stand toiletries until they can be put away in the wall cabinet but there are so many different vanities and your favourite will be différent to others and it's quite easy to replace a vanity as long as there is enough available space...i would choose a wall hung 1200 wide vanity with a single drop in sink and only consider twin small drop in sinks with a minimum of 1500

@wuff, Thank you so much, and congratulation for your renovation, I wish you will enjoy it for so many years to come. Yes, I agree living into a granny flat next to my son was my husband wish before he passed away. It is good to be close to family. Also I love the suburb which I have been lived in for 22 years. My Daughter and her family is living close by too. Most of my close friends are living around and we always gather for a brunch, or lunch or watch movies. The good thing is most of my friends pick me up and don't let me drive most of the time when we go out. Thank you again