A couple of points to add with regard to the functionality side of things: Grey tiles, means grey grout which will be infinitely easier to maintain, every home that has cream or white floor tiles will ultimately end up with dirty grout lines, no matter how well you look after the floor. Grey tiles also hide dirt/hair etc better than light coloured tiles. From a design perspective, as long as you choose a tile that is quite simple and elegant, grey is almost always in style. Matching things to this colour palette is not so difficult, maybe stay away from microfiber chocolate couches though!

Go to a building design draftsman. They have an amazing ability to see things differently to us mortals. Will do smaller jobs without the extra cost of an architect. Some savvy interior designers can also do that. Make sure you find someone with a good reputation for design skills

Having lived for years with a front loader in the kitchen under counter and now with a good sized laundry I am resenting the laundry for the space it wastes! I would rather have a "european solution" and a good en-suit and walk in :) really it is a matter of how you want to live, in reality if you spend your life considering resale you won't enjoy your home, prospective purchasers will love or hate whatever you do, those that don't want a space solution will be the ones who want the big ensuite and robe anyway! Do it with love then others will love it too, good luck

When we went shopping for dining chairs we had difficulty finding a style that was comfortable for everyone because of different leg lengths. I agree with the advice that you really need to try the chairs to find what's comfortable for you. I think your chairs look fine, simple and versatile, but their suitability might depend on what else you put in the room. I noticed one has a chair pad so is it too low or not soft enough for someone? How keen are you for a pendant light? It doesn't look like the existing lights line up with the table? So if you were to change to a pendant light there would be some patching and repainting of the ceiling involved. There's a ceiling vent to factor in also. If you have looked at the lighting stores' websites and not seen a light that you really like is that effort worthwhile? Could you post a sketch please. That will also help us understand traffic flow through the space. Is that the edge of your existing sideboard at the bottom left of the picture? Or the edge of a kitchen bench? Is that a sofa in front of it? Does that need to stay? What do you need to place/store in the room or would the console be purely decorative? Are you sure about the dimensions? My first thought was 4.9 isn't small yet the picture looks small. Then I realised it might be the angle of view and I noticed the sofa which means the room must be longer than it looks.