It faces south, is 8 meters wide, and is 10.8 meters long. In which direction should the kitchen and bathroom on the first floor be arranged? And where should the stairs be placed?

The kitchen is not shown in the picture, but it can tell you that it is best to face east or southeast.

The house faces north and the bathroom should be in the west, or in the southwest, northwest, and northeast. These four directions are the best.

The bathroom in your picture meets the requirements mentioned above and is acceptable.