There is a touching account of life with the late Mikhail Moiseyevich Botvinnik as related by his daughter Olga available on the website of the Russian chess federation here. It is in Russian, but even English speakers should persevere.
She speaks of a two-room flat in Moscow where they lived from 1944. Note that there were five persons living there; Botvinnik, his wife Gayane, ailing mother, Olga herself and a nyana (a nanny perhaps?). There is also a discussion of life at Nikolina Gora.
Observe the comment that Perestroika misled the younger generation into believing they would get Western style capitalism, whereas Botvinnik forecast they would obtain capitalism as practised in Latin America. The late world champion was closer to the mark!