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You can either go for a 1 ton AC or a 1.5 ton AC depending upon the amount of light that enters the room, area and direction of windows, the floor on which your room is situated, number of people occupying the room and the number of lights.
The power consumption of a 1 ton AC (we describe below what a ton of AC means and also have a section on how to select the correct size of AC depending on room size) in a middle floor bed room of a flat, will be about 1.33 Kilo Watt Hour or 1.33 unit of electricity per hour during the night.