The book is a 1961 recollection of three visits to Russia, which included several meetings with Stalin in the period of 1943 to 1948, written by Milovan Djilas, a then leading Yugoslav communist. Djilas, who wrote the book inbetween two stints in jail over no longer toeing the party line, does an excellent job of combining both the rapture of the meetings from his 1940s perspective, as well as the sobering effect that both the meetings, as well as his later experiences had.
The book is perhaps not the most useful source of historical info on the period, or even of a comprehensive understanding of Stalin's character but it does form a good puzzle piece to get a 'rich picture' understanding of the Yugoslav-Soviet relationships at the time, as well as of how Moscow operated from a foreign Communist movement's point of view.
Djilas peppers the book with his impressions of leading characters of the time, from Dimitrov (Comintern & Bulgarian Communist leader), to Khruschev, Beriya, Molotov, various leading figures of the Yugoslav communist movement (Hebrang does not a good character reference get; Tito, Kardelj and Rankovic are not explicitly assessed, though) and these impressions are certainly one of the strengths of the book.
At the same time, he describes some of his disenfranchisement with the Soviet approach and the slowly developing disillusionment of many aspects of the communist ideals or more precisely, of the implementation thereoff (especially the Soviet kind).
The author does not hide his fascination with Stalin as a character, although it is never without reservations. The late night dinner events, filled with thrusts and parries, probing and other means used by the Soviet leadership to further their goals. At the same time it is interesting to see the creeping insularity of the Soviet leadership, the toadying going on in front of Stalin, the gradual senility setting in...
Overall a much recommended book, made all the better by the ease with which it can be read (not quite a page turning thriller but reasonably gripping nevertheless). If you are interested in getting a more comprehensive picture of the period, of the Soviet-Yugoslav relationships of the time, the idea of a Bulgarian / Yugoslav / Albanian union, or a personaliy illustration of some key figures, the book is a valuable addition to your library.