Landlord frequently showed up unannounced to bang on the door until someone would answer, and I'm fairly sure invite himself in otherwise. When we had disagreements he would start getting angry, yelling, and eventually taking out his frustrations with other (and past!) tenants out on us. He also tried to impose rules on us that were not in the lease agreement about guests, quiet hours, etc. The building is also wired up with cameras on the inside, which while legal, wil be used to watch, text and harass you. Renter beware!
This guy let himself into the apartment on more than one occasion. Once when I was in bed and didn't answer the door, he just let himself in anyway. He screamed at us when we had guests and significant others over, even though the lease didn't have any guest rules. We were always quiet, clean, respectful, and paid rent on time. He waved a wrench in our face once while threatening us, saying we had secret roommates. He used to watch us from his car, convinced we had other roommates (nope, he was just paranoid and insane). We had to break the lease because he was so abusive. We were going to get a restraining order if we couldn't break the lease.