Who builds it like that
If you at least once pasted the wallpaper, then you must have encountered such “delights” as uneven walls. All these holes in concrete, waves, cavities. This applies not only to the buildings erected during the time of Khrushchev, but the modern ones also leave much to be desired. So the alignment of walls is unlikely to have to avoid. By evenness, they should resemble the walls of the washing machine or refrigerator. By clicking on the following link you can buy a wheel excavator in St. Petersburg.
To do this, use the material putty. And you oh, how much it will need. For example, about one hundred and fifty kg of material will go on a room decoration of a room with a size of 8-10 m2.
You can contact the help of drywall, metal profiles are attached to the wall, and drywall is placed on it. But this is significantly stealing the size, so if the room is already tiny, then perhaps you do not have to come to this decision.
There is still such a method as stretch walls like stretch ceilings. Which, too, although less affects the size.
Can be sealed with fabric, it is attached to the walls instead of wallpaper, it masks all the bumps well. And it looks gorgeous.
And it is better that the builders would think about us and erected the walls immediately qualitatively, and not quantitatively. Successful apartment!