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Discern the direction of it, and if you don't know how to do it, ask a professional to design it.
Your living room is only 18 square meters, 10-piece mahogany sofa is estimated to be unable to fit, the sofa is 3 + 1 + 1 + 1 + 1, with 5 coffee tables, which is simply not able to fit You should buy a 6-piece set of 3 + 1 + 1, 3 coffee tables, so that you can barely put down. Thank you.
That depends on the total size of the ten-piece set. In principle, it can be put down, but it seems that the space is small.
Three meters by three or four meters, how to hang the ceiling of the house? I think it's the kind of ordinary plaster that goes off the line. Because of the suspended ceiling, the house is very low.
The rooms on both sides and the bathroom are placed in the middle. The rooms on both sides are 3 meters long and 4 meters wide, and the rest of the dimensions are for the bathroom.
For the living room and dining room of 4 meters and 8 meters, it is normal for the ceiling to be not partitioned, because it will appear that the area will be larger.