My wife is currently staying at the Longemont in Shanghai. we are in contact daily using Apple's FaceTime on our Macs. This hotel would rate a 3+ or 4 rating if it weren't for the daily dose of sewer gas that fills her room at night when she tries to sleep.
We've stayed in a number of hotels throughout China, and the smell of sewer gas coming out of the bathroom drains is pretty common. It is a terrible smell and in her case at the Longemont, it is very upsetting and disgusting. It gives her headaches, nausea, and fatigue. Look up "sewer gas" on Google and you will find it is very noxious and even toxic. Her symptoms are classic for exposure to it.
She has to call someone at the front desk (who doesn't understand English well enough to help solve the problem) and have them come up and check it out. Then they contact the hotel engineer who comes up and "closes the valve". Apparently there is a sewer vent valve that automatically opens/closes late at night. When this happens, the gas backfills through the drains and fills the room with the stench. China has not embraced the use of p-traps that use a plug of water in a u-tube in every drain to stop the gas.
This is a 5-star hotel, highly rated. What is with this place that it doesn't have proper plumbing and ventilation? I think she should get her money back or have them repair it.
The hotel manager offered to move her. Consider her position: 1) she's on a business trip, works all day, prepares for the next day until bedtime, and tries to get some sleep. 2) She's there for 3 weeks, has a professional wardrobe that requires hanging up as soon as she arrives; so she has emptied her carefully packed suitcase and moved into the room. 3) This happens at night as she is getting ready to sleep or is asleep and is awakened by the bad smell. If she were to pack up and move, it would take her two-3 hours, literally, at a time when she should be sleeping, is already exhausted, with no guarantee that the whole problem wouldn't be repeated in the next room.
Avoid the Longemont. The Chinese hotel industry does not understand service, nor, apparently building construction, design and basic plumbing and health issues.
And the walls are very thin. She can hear a person in the next room snuffling all night and wheezing (maybe suffering from sewer gas, too?)
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.