The pronunciation on "bastu" is totally weird here. The "a" should have a short sound.
In the new voice, the normal-speed sentence is okay but hovering over the word still gives a long a sound.
Can I use just sauna in swedish as well? It seems like an international word to me...
... which is short for "badstuga" by the way.
(Bad = bath, stuga = cottage)
Since the phenomenon is quite as original in Sweden as it is in Finland, there is also a proper Swedish word for it, whereas other languages/countries imported both the word and the phenomenon from Finland.