If there is any deterrent effect on the staff of the Texx Hall when making the restroom, customers c

As long as you have a reasonable layout, you can certainly make a bathroom.

Simple! Separated! Middle corridor, symmetrical on both sides: toilet, storeroom. Or, bathroom, kitchen.

Yes, there is no problem, many small apartments in the north are designed like this.

You should knock it out and restore it to the way it was, because if you think about it, the bathroom is on top of the people's hall, people are entertaining guests in the hall, and your house is flushing the toilet, do you want the sound to be good? In case people are talking in the hall and watching TV, and your toilet sounds for a while, do people feel good? In case of water leakage, sewage leaks into the hall below, how will people live? >>>More

Find a plumber or take matters into your own hands to find out the cause and rule it out. Don't just be suspicious.