'THE NAME IS POPOV, DUSKO POPOV"

This may seem hard to believe, but it is true.  Please read THIS LINK.  You will learn that Ian Fleming, author of the James Bond books, was inspired by the flamboyant Serbian counterspy, Dušan "Duško" Popov.  Popov came from a well-established Serbian family and this entire building at #5 Francuska Street belonged to them.  If you'd like to read the book he wrote (and shell  out big bucks since it is  out of print in English), check THIS LINK.