Stanislavski also has a sister, stanislavski, who was born in Bulgaria in 1985. She was chosen to play krum when she was studying in a boarding school in England. When the casting director of Harry Potter visited his school and heard him talking in the corridor, stanislav had been studying in a boarding school in England for four years. Fiona Will, the director in charge of casting, asked the dean of the Theatre Academy if stanislavski would like to audition for the role of Victor krum. Stanislavski was listed as one of the candidates after the primary election, but because of his academic arrangement, he missed the second interview, so he thought his chances of being selected were greatly reduced.

Stanislavski got another audition and was chosen as one of the final candidates. Although he has never participated in a professional performance, his family has a tradition of performing, and the casting director is obviously aware of his talent. After meeting the casting director again, stanislav was invited to meet Mike Newell, the director of Harry Potter and the Goblet of Fire. Then he was told that he had been chosen to play Victor krum.

When not filming, like his character krum, stanislavski likes many sports, including tennis, football, rugby, track and field and swimming. He is a fan of the Bulgarian national football team. But also like animals and have a lot of pets.