Sometimes it's not you, it's them. Long story ahead
We had a downstairs neighbor once, that went bat crazy about our noise. They worked nights, and slept during the day. Complained about all the noise during the day.
I had a 12 and 2 year old. 12 year old is at school all day then went to a friends house for "daycare"; 2 year old at daycare; DH and I both at work. The only time we were home during the day was on Saturday and Sunday---and we usually were gone part of the day on those days as well. The noise was coming from 2 cats, about 5 pounds each.
I need to add, the apartments faced the playground and the pool area. There was more noise from those two areas than from our apartment during the day.
One day, I had a weekday off, but I sent DS to daycare, so I could go grocery shopping and have a "me" day. I was sitting at the computer desk, playing a game....the cats started running around the living room, and the guy started thumping on the ceiling.
A few days later, the kids were outside at the playground (I was on the front step area, watching), and he came outside and started screaming at the kids to be quiet. It was about 1pm. He didn't see me on the stairs, I rushed down. Sent the kids upstairs, called the police as he had a baseball bat in his hand, and the kids were panicking. Police came and told him to suck it up, it was 1pm and he chose the downstairs apartment next to the playground and pool.
The next week was utter hell. Our garage was up against their apartment, we used it for parking one car, and storage. They would park their car in front of it, so I couldn't get out. They pounded on the ceiling day and night, anytime they were home. Blasting music at 3 am, when they'd get home from work.
Every single time, I called the police and documented it with the apartment complex. After a week, I told the complex we wanted out of our lease, and they let us break it without penalty. We moved, and did the move with several large guys who walk "heavy". The guy walked out, fuming, saw the guys, turned right back around and shut his door.
Next day, I was cleaning the apartment for turn-in, and the kids were outside on the steps, not making much noise (DD reading to DS), and he came out, raising hell. Again, like 2pm. Called the cops, took the kids to the apartment complex office and told them I couldn't finish the clean because it wasn't safe for me and the kids to do so.
They didn't penalize us for the uncleaned carpets or garage.
The guy got evicted right after we moved.