A wonderful place!!! Just keep this in mind - you need to go to the archive prepared! Understand exactly what information you would like to know and for what period of time. And then the archive staff will always help you!!!
I was searching for a family tree - everything worked out. The search was conducted by a woman - one of the oldest employees of the archive. An amazingly literate, educated and kind-hearted person. I explained everything to the smallest detail.
Overall, the staff is helpful. People know and love their profession.
If you really need to come here, you will have to persevere. All employees, starting with security, are not happy to see you and will probably say that "we have nothing."