One night means that the price of 99.8 yuan can only be used for one night. If you stay longer, the rest of the night will be calculated at the normal price.
I lived in Shanghai for 99.8 yuan, and the facilities in that room are at the level of 80 yuan-100 yuan. Make it according to your own situation. Her only advantage is that you can book online.
PS: The sanitary conditions in Shanghai are very poor, so I don't want to talk about it. In short, it is not good!