What does it mean that 80 yuan is alone in the private room of Jindi Hotel?

A private room in a hotel means a private room.

Generally speaking, a standard room is between 100-280, and the price varies according to the grade. It's expensive and cheap, a five-star room is about 200-300. The private rooms in the hotel are actually accommodation rooms, just like the standard rooms in the hotel, but with higher grade and more expensive price.