Having grown up in one of these myself in ex-Soviet country, I hate them with passion. The quality of utilities is awful: sewage pipes get clogged all the time and whole buildings smell like piss more often than not, thermal insulation was practically non-existent and tried to be compensated by extensive heating that had poor circulation and no way to be adjusted flat-by-flat basis, so if you live in bottom floors you would have to open windows in the middle of winter, and if you live in the upper floors, you have to sleep with your clothes on and few layers of blankets. Sound isolation was also so poor, you didn't even need to turn on TV or radio, because you could hear neighbor's clearly. The whole blocks of the same, bleak, monotonous houses are also very depressive place to live in. Currently most of the remaining Khrushchyovkas are getting renovated (something like this: http://www.manostatyba.info/wp-content/uploads/2016/08/mazei...), but I shudder even to the idea living in any of them again.