There are many synonyms for the phrase "nice quiet people". Some possible alternative phrases are "kind, reserved individuals", "gentle and introverted folks", "pleasant and soft-spoken acquaintances", or "friendly but reserved folks". Each of these phrases conveys a similar meaning to the original, while also presenting a slightly different emphasis or connotation. For example, "kind, reserved individuals" might suggest a greater focus on the person's kindness than their quietness, while "pleasant and soft-spoken acquaintances" highlights their politeness and gentle demeanor. Ultimately, the choice of synonym will depend on the context and desired tone of the text in which it is used.