I enjoyed my stay at Generator. I didn't hear any noise at all from downstairs but we did come in the off season!
The location was awesome, great proximity from Central Station and Old Town.
The downsides for me were the automatic bathroom light, it is a little temperamental and would go on randomly but would turn off if I was on the toilet lol. Also I didn't realize we weren't supposed to bring in food, maybe I missed it in the airbnb posting but there are signs saying you're not allowed!