There will be a height difference, you will need to use a reducing strip into the study and lounge. Don't forget the timber floors will also reduce the height of the skirts unless you are planning to take them up. Will you be continuing the flooring under the dishwasher & fridge, this will also change their heights. In the long run better to take up the floor, there are companies that will do it in a day, leave the floors prepared and take away the rubbish for around $30 m2.

I think you can very well still have plants in a windowless room- as long as you're willing to give them regular little 'windowsill holidays' in another room. I'd go with succulents, there are some great warm colour combos (see Pinterest for ideas) and the geometric shapes mimic your tiles. Of course, there are some incredible fake ones around too, saw one last week I could not pick from the real thing. I'd be tempted to mix in some of both to balance aesthetics with practicality! Separately, I'd be careful of adding any soft furnishings (rugs, spare towels, etc) to a small powder room. We are all aware these days that a flushed loo spreads germs a meter around it- I wouldn't want to be collecting and trapping them! I think (subtle) fragrance and votives would warm this lovely space without impeding hygiene.

Thanks everyone! We will live it with now. @ cloudpants and suzineedsahouse - The ideas about putting something on the bench to distract the eye is a good idea. Maybe a nice plant? @ Elements at Home - That's an awesome idea. One big door on heavy duty hinges. We'll use the drawers mostly, so we won't be opening and closing them often. I'll definitely investigate that option further. @ dohraine - Only one drawing out of the 60 or so drawings showed the position of the taps in correlation to the doors. But, on paper the difference really wasn't that noticeable. The bench is Caesarstone. The pictures are a week or two old so the filing is all complete now (or it should be, I haven't seen photos of the interior in a while). I'm not sure just replacing the Caesarstone and sinks is a viable option.

We had laminate floating floors for 7 years, when purchased was told they were high quality and commercial grade 20 year warranty, and were laid by the store. We have just replaced them with vynal plank so happy, the laminate had worn terribly at the edges and scratched every where, very noisy even with under lay, and so painful to keep clean with spraying with a water metho mix wiping and then drying and they still lifted at the edge. Would never put laminate down again. We might have got a bad batch and we did try to claim on warranty but the store argued it was water damage and would do nothing. When we pulled them up the underlay had no marks on it from water.