Where'm I gonna live?

[glatt]

I think you're handling it perfectly. They know that they have to fix it.

[Lamplighter]

UT, I understand and agree with your approach.

But, giving proper written notice does not make you a s-o-b.
It is just the fairest legal way for tenants and landlords to deal with one another.

It establishes the tenant's rights, which are necessary to avoid possible future
events such as law suits for unpaid/past due rent, eviction, and/or retaliation by the landlord.
If tenants are in a lease or month-to-month agreement, they cannot just walk away,
and certainly can not make repairs or alterations on their own
- usually unless they have (usually) written consent of the landlord.

Each state may be different in how written notices are to be delivered.
First class mail is the default manner, but you need to know what is required in your state.
In Oregon, others forms, such as registered, certified, return notice mailings, are not legally valid notices.

Lastly remember, all Property Managers, like Real Estate agents (by whatever title),
have a fiduciary responsibility to the property owner... not to the tenant.

Friendliness does go a long way ... right up to the point that $ is involved.