I'm going to buy a treadmill and put it at home. I intend to exercise from time to time. Do you think it's reliable and not disturbing people?

Treadmill will not be very noisy and will not disturb people. Personally, I suggest running outdoors or going to the gym for professional and systematic exercise. Because most treadmills become furnishings after being bought home several times, if you want to buy a treadmill, buy a second-hand or cheap one first. If you can persist for a few months, you will regret the rest later.