Yes, I have been to this museum 3 times now. The space nerd in me freaks out every single time.
It is what you would imagine - space suits, space capsules, space photos and, my favourite, space food. A lot of these objects made it into space and back.
The more personal stories about cosmonauts are incredibly touching - Leonov, who was the first man to do the “space walk” was also a keen painter.
Make sure to get there early and avoid Sundays (unless you would like a free entry, but keep in mind that it gets crowded).