Well, Selenica, I, as well as many others on this forum have, several times.
The private apartments no longer exist as they were, but the place is huge, uncomfortable and cold or overheated.. There were no real outside places to enjoy, The other palaces out side of the city had more than enough of that. It was much like Buckingham Palace- a working office building. Also a target.
After Alexander II died there, from assassination, I think the family generally avoided it other than formal occasions.