Wear slippers while in your upstairs apartment. This will lessen the impact of your footsteps, thus limiting the sound your downstairs neighbor will hear. You should always remember to remove your shoes when entering your apartment to ensure that your downstairs neighbor doesn't hear you stomping around.
Place rugs in your apartment if you have hardwood floors. Doing so is another way to decrease the sounds of steps coming from an upstairs apartment. You can also put your furniture on these rugs. This keeps your furniture from moving around, thus limiting noise a downstairs neighbor may hear.
Buy elevated shelves for your TVs and stereos. Lifting these items off the ground will keep both the sound and vibration from traveling to your floor/your downstairs neighbor's ceiling. You can also place items in the shelving underneath your TV/stereo, such as books, DVDs and CDs.
Close your windows when you can. When your windows are open, your downstairs neighbor is even more likely to hear your conversations as well as whatever you're watching on TV or listening to on a radio.
Limit late-night guests during the week. Having half a dozen people walking around your apartment at 11 pm on a Monday night will be very irritating to your downstairs neighbor who has to work the next morning.
Do your cleaning and other such errands on weekend afternoons. There will undoubtedly come a time when you will wish to run a vacuum cleaner or move stuff around your place. Performing these chores at 1 pm on a Saturday is much better than doing so at 9:30 on a Tuesday night.
- Inform your downstairs neighbor when you know you'll be making excessive noise. This can be when you're moving a large furniture piece into your place or having lots of people over. Notifying your neighbors of these instances is common courtesy and will be appreciated.