In addition to the electrical supply in your apartment, remember that the S7 should be considered a LOUD 1200W heater. While nobody has tested one yet, every expectation is that it will be at least S5 loud. Think vacuum cleaner loud. Maybe Bitmain worked some magic, but the fans that are present are expected to be noisy and powerful to keep the 1200W blades cool enough. If that fits your apartment situation, then you'll be good.
Along with the above I will do a very long and through review. Sound meters. Different fans. ways to reduce noise.
That said. At best it will be 72-77db and nasty pitched when it arrives.
I think I can do 65db and better pitch sound with high hash say 4400-4800.
I know I can do 45db to 50db with downclock to 3000gh
I hope I can do 45db 3000gh and .18 to .20 watts. with downclock and voltage drops.
see highlighted...really? (if measured with good dB meter)
anything at 60-61 db is already quite nice (Sp20 produces that much at setting 10)
if you can get to 61db at 4200-4400GH, it would be SUPER-i would definitely buy more then and I have some ideas about fan mods as well.