La idea, atemporal.
Upholstering your walls or adding fabric wall panels is an attractive way to sound proof any apartment.
Might need this... How to upholster walls.
Gorgeous flat with decorated ceilings and walls - via cocolapinedesign.com
Burlap Wall Design - edges covered with braid trim and nailheads; applied over batting
Adorable girl's bedroom with bed built into nook that has padded walls
The Studio Harrods - London Luxury 4 Bed Apartment
Horsehair fabric upholstered wall panels at the Mandarin Hotel