So many befriended Nini, in fact, that as Jan Morris writes "around him there grew a dead-pan cult, rather like the mock-serious fraternity that has grown up around the fictions of Sherlock Holmes and Bertie Wooster." He had his own visitors' book at the cafe, signed in time by a Pope, a Russian Czar, an Emperor of Ethiopia, the great statesman Metternich, and Verdi (who wrote a few notes of Act III of La Traviata).
When Nini died, many kind words were lavished upon his memory. There was a memorial effigy, a plaque placed on the cafe wall, and a poem from the historian Horatio Brown, a fellow prowler of the Archives:
What wit and learning died with you,
What wisdom too!
Take these poor verses, feline cat,
Indited by an Archive rat.
--Once more from Jan Morris, A Venetian Bestiary (Thames and Hudson, 1982), pp. 70-71.