In case anyone else is interested in this family, I got the wedding cert. for Peter Fiorentino and Rose Chandler - married in registry office, 1885, fathers SALVO Fiorentione [sic] a mariner, and Henry Chandler, a mason. Ages 30 and 20, bachelor and spinster.
So if Salvo was Peter's father, it looks like Salvo (aka Samuel) Fiorentino married to Mary Cath. Hyde might have been Peter's brother, since both couples were managing the boarding house at 151 Bute St during the same period