mensch
A very sound, reliable, or honorable person; a person with great integrity or strength of character. From the Yiddish word mentsh, with spelling taken from the German word Mensch (human being). Tom's a real mensch, always willing to help a friend in need no matter what. I can recommend Sarah without hesitation—she's proven to be a real mensch in her time at the firm.
mensch
(mɛntʃ) n. a mature and responsible person. (From German via Yiddish.) Now there goes a real mensch!