A versatile player, Kienast played predominantly in midfield for Rapid, but was also employed in defence or in attack. After his 14 seasons at Rapid, he moved to city rivals
Favoritner AC. He finished his career with minor sides Süßenbrunn and SG FavAC Simmering. In 1993/1994 he became assistant-coach at Rapid. He played a major part in the most successful of Rapid teams in the 1980s, claiming the
League crown four times and most prominently losing the
UEFA Cup Winners Cup Final in 1985 against
Everton. He skippered Rapid from 1989 through 1992 and was voted Austria Fan's Footballer of the Year in 1986. ==International career==