You’ll be fine on a balcony. Prusas are fairly quiet. I have an enclosed printer (a Voron) and it’s fairly quiet. I WFH 2 days a week and am able to have it printing 10 feet from me while working and on calls without issues. I wouldn’t call my old unenclosed printer loud, but it wasn’t quiet either.
They have a mode called stealth mode that should reduce the quantity of noise produced by the steppers: https://help.prusa3d.com/article/power-modes_2213
Evidently the mk3 was significantly quieter than the mk2 with this mode enabled.