Sound proofing between apartments on the same level was adequate. However, if you live on the ground floor, or 2nd floor with the 3rd floor above expect to hear everything your upstairs neighbor is doing including walking, using the bathroom, having "whoopee", etc. Sound proofing between the floors seemed to be non-existant. Also, the windows offer little or no noise insulation. If people are outside talking or on their patios, you were going to hear it.
Office staff doesn't care and picks and chooses what is enforced in the lease. They choose to ignore noise and lied about you being able to hear people walking above. When I confronted them about the lie they still denied it happens.