The times that I have actually used the pax laundry it has not been loud at all...even *inside* the room. Sure...washers and dryers make a certain amount of noise but for the rooms I've seen there was only about 3 of each. They have cabin-style doors on them which stay normally shut so that cuts most of the noise. I personally would not have a problem booking across the hall from a pax self-laundry. I would probably avoid a cabin right next to one, sharing a wall.
I *believe* you can select temperatures...but don't hold me to that!
I've had very good luck with *my* shirts & such. My DW will not send any of her stuff, though.