Definitely NOT the Modern on M complex (including the older Classic on M buildings) in SW. my neighbor’s masturbating multiple times per day nearly drove me to insanity. I could hear his phone notifications, his sneezes, and every single word of every single late night phone call. 20/10 do not recommend.

I’ve lived in two old buildings in upper NW that were/are so much better for sound. Not 100% soundproof, but damn near close for an apartment.