A notable feature: a whisper in the corner (near the small columns on the right) will be clearly heard at the other end of the hall, near identical small columns - as if a voice were speaking to you from the wall. :)

I note that it was closed when I visited, but the attendant, on his own initiative, offered me to see it: opened the door, turned on the lights, and waited patiently, not objecting to my photographing, and even offering explanations.

Such attitudes differ markedly, to say the least, from the normal actions of the attendants at the Orthodox churches.
I say this as an atheist, from the sidelines, as it were.

Ginzburg had donated the most for the construction of the building.