I find it hard to offer up or encourage mediocre or substandard. I understand there is a lot of information and circumstances that effect a design; but when that information and circumstances is not made known, it is next to impossible to give valid advice and assumptions have to be made. I assume people are here asking questions to improve what they have to the highest degree possible, and I point out areas I see that could be improved or I offer a conceptual solution to improve what they have knowing full well there may be extenuating circumstances that lead them to what they have. I see many times people are under the impression that they can not afford the services of an architect, where in reality it is that they can not afford the one architect they talked to or are relying on hearsay. There are architects out there for just about any budget. There is most of the time a big difference between architects and house designers and the like. That is something even the people at Houzz can't figure out. Perhaps the lack of plans offered up for review here on Houzz is a result of people realizing that the best way to have the home they need and want is to sit down with an architect and get to know each other. The architect can discover their needs and wants, walk the site with them, discuss at length the dreams and possibilities of what their home can be. The owner can ask questions and see their home develop before their eyes in the form of sketches and scribbles; a personal/professional interaction that creates home. Perhaps I am being overly optimistic.

Have you thought a bout a color instead of white. I love soft gray/ greens for a true neutral that usually works in every kind of light.Opaline and Sea Salt are two you could check out.

West Elm I would select a black finish over the staircase. What you decide to do in the kitchen and dining room is your call. https://www.westelm.com/shop/lighting/pendants/?cm_type=gnav I like these bubble glass pendants and think they could be used in the kitchen and the chandelier version in the dining area. This has to be your choice. There's just too much out there to select from.

If you can't match the MATERIAL then match the COLOUR. A 'continuous' floor material isn't necessary. But a continuous COLOUR of floor is. You can put down 'brown' tile to match the brown 'wood' in the rest of the house. It can be done easily and without much effort. I tell people to pick their three favourite wood floors (grab samples) and then go TILE shopping. Find the BEST colour match (stone, ceramic, porcelain, cork...whatever). When BOTH are installed you will have a floor that LOOKS continuous. And that's all that matters.