If it makes you feel any better, we had an AC problem on our Windstar cruise last year. We were in an ocean view cabin so no balcony. We kept the cabin door open during the day but sweated it out at night. They sent techs to the cabin 2 or 3 times to work on it, replaced the thermostat and it slowly got better. The was never any apology or compensation.
I've read that this a problem on other sailings on the Star Breeze.