The kitchen water consumption of two or three people in modern families is not large, and the water consumption point is controlled in the sink. Just pay attention to leakage prevention, there is no need to bother to separate the high and low layers. If you are not at ease, you can also apply a waterproof layer before laying the floor tiles to prevent leakage to the ground downstairs. Let's see if there will be water in your kitchen. Actually, tiling will look good. If there are tall children at home, it is easy to trip. You can put carpets or unwanted old clothes in front of the kitchen, so that you are not afraid that water will be brought to the living room. The key is how convenient you are. Everything serves your life and brings convenience to your life. This is your first consideration, not whether it will work or not.
The kitchen is the lower room and the dining room is the upper room. You can only make the kitchen low, or flat, but not high. This is {Feng Shui}. Choosing the right color of the threshold stone can reduce your visual error caused by the height difference between the two, but you must be careful when walking. For family members, there will be no problem if they are familiar with it. The choice of color is only to reduce the visual error caused by height difference. Personally, I suggest plastering the facade with high-grade cement (425#) at the kitchen door, and then brushing the facade with waterproof agent for 2-3 times after the cement is solidified.
It is best to be flat, because uneven roads will also have a certain impact on walking. The simplest way is to shovel off the kitchen floor, or spread more things on the living room floor for leveling and laying floor tiles, which is easier to walk.