First of all, if the kitchen and bathroom are tiled, use the original mud wall. Personally, there are several problems: the first point is that the wall is very easy to get dirty, because the cement wall is rough, and even if it is smoothed, it will have a rough surface. It is particularly easy to accumulate dust after the surface is rough, and it is very difficult to clean up the cement wall area after it is dusty. The second point is that cement walls are easy to sand, and it is very unfavorable to make cement walls in our kitchens and bathrooms. In addition, the bathroom and kitchen belong to damp places, and the dust is difficult to clean.
If you want cement style, you can choose gray brick. There is no need to leave a cement wall like the original industrial style, which is really inappropriate. The second is the kitchen, with a ceiling at the top of the bathroom. The ceiling is above and the tiles are below. It's just that the cement in front is also very inconsistent. If the color system is unified, it will look good.
If you really want to use cement walls, you should apply waterproof paint after leveling the cement, so that you can keep the front clean and waterproof. It's just that waterproof coating is too expensive and uneconomical. If you paint, it is not proportional to the effect or economy, and because the bathroom environment is humid, the paint will fall off after a long time.
The above is my answer, I hope I can help you!