Kuustonen is best known for her appearances in the Finnish television series Putous (2011–2014), Helsingin herra (2012) and Syke (2014).

She has also played in several movies, including The Kiss of Evil (2011) and FC Venus (2005).

[3] She has also performed in Ronia, the Robber's Daughter at Suomenlinna summer theatre in 2011,[4] and in Espoo city theater's musical Kojoottikuu in 2014.

[5] She has also done a lot of Finnish dubs to movies, including Kung Fu Panda (2008), How to Train Your Dragon (2010) and The Croods (2013).

[6] Kuustonen was engaged to Sebastian Rejman but in June 2022 the couple announced that they have separated.