Central heating in rental appartment

Central heating? Is this in a panel building?

At the moment I do not know who you can complain to.

If all else fails, perhaps someone in your local city hall would know who or where you can report this issue.

Panel buildings are known for these sorts of issues.

Look at your rental contract, perhaps they state who is responsible for repairs.

Paying a year in advance might of been a mistake.

I asked my HU husband what to do. He believes by your discription  that it is a panel apt. They are known for being hot in the summer and cold in the winter.

Most people who own one put up extra insulation on their walls.

The temp; in each flat is the same, perhaps if you are facing the sunny side of the building, it might be a bit warmer inside the flat.

The price of the heating is included in the rent and if that is the case, there is little you can do but use a portable heater along with the heat the building provides.

It is getting a bit nippy, we have a 50 sq. meter flat and have one gas heater in the living room; I suppliment the heat in my room by keeping the large double wide door open to get heat from the living room and use a small electric heater for when I am sitting for long periods in my smaller room.

Loads of sweaters and sleep with the heat off at night by using allot of covers.

These old places need to be redone up.