in a 10 square meters mahjong room, you can use a round mahjong table with four chairs around it. The table should be placed in the center of the room, with enough space around it for players to move around comfortably. You can also add a small cabinet or shelf to store mahjong tiles and other accessories. The walls can be painted in a light color to make the room feel more spacious, and you can add some wall art or decorations to create a more inviting atmosphere.