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2 floors small apartment

Hi everyone, I need help in order to understand what I need.
I have a small 50sqm apartment, first floor is living + kitchen, and second floor is for the bedroom and bathroom.
I will update my boiler on January with a condensing one.
The thermostat is on the second floor and the problem is that the living room temperature is always 2/3 ºC lower than the upper one.
I would like to have 2 zones and be able to have similar temperatures.
I have 3 radiator: living, bathroom and bedroom.
What do you suggest?