How do people fix Noise in a Duplex?

[Sean Sloop]

Hello BP, 

How have people that owned 2-4 Units dealt with noise transfer between units?

I have a Triplex I am living in that is 3 levels. The First floor is my unit a 2 bed, Second Floor is the same floor plan, and the attic is a Studio. 

I am currently renting the top to Airbnb and the second unit to a Traveling nurse. She just mentioned its hard for her to sleep because the attic footsteps, chair moving, etc is all very loud. 

The attic has hardwood floors and the kitchen is basically above the bedroom for the second unit. (Pictured below)

I do ask my guests to be considerate of noise after 10pm, but not much I can do at 7:30pm. 

What options do I have to soundproof the bedroom at least? Obviously, as minimally invasive the better, but I am guessing my options are limited. 
 
Thanks in advance!

[Jimmy Chao]

1.Add mass along the path that the sound takes to get from its source to your ear to decrease the amount that is transmitted.

2.Add absorptive materials and mass within the room to decrease the amount of sound that bounces around in there.

3.Seal any cracks where air can get in. Where air can make it through, so can sound.

Maybe pick up some cork tiles and affix them to your walls to accomplish both 1 and 2. Make it a pattern. Add a carpet.

Your door is a weak spot for sure so get some peel and stick weather stripping that the door will close onto. Search compression weather stripping. At the threshold you may need to lay something down when you're in there.

Think about the noise source as vibration source and try to isolate that from things that will pass along the vibration or even amplify it. Your walls may be acting as a drum if they're not built terribly well or filled with noise dampening insulation.