foufymaus,
Clean the machine's insides within an inch of it's life. Then oil it really good with Tri-Flow oil and (I think it has gears too ) grease the gears if it has them, with Tri-Flow grease. Then run the stuffins out of it and do it over again. That will help quiet it down a bit.
I have one much uglier than yours and it's a great, albeit noisy sewing machine. Mine doesn't have a home yet, if I had the room I'd put it in a cabinet.
Mine doesn't have the light switch either .... hmmmm.
Joe