When you show the apartment, you want to treat each viewer equally. Don't offer one couple a cup of coffee, then not offer it to anyone else. It might imply preferential treatment toward the first viewers. If any of those who subsequently saw the apartment should later compare notes with the first couple, they might conclude that since they weren't offered coffee, you were biased against them. Then they might file a discrimination complaint.

It might be beneficial to hold an “open house” on a particular day — weekends are the best. This will better ensure a uniform selling approach and save time for you. In addition, prospective renters aware of competition for the property are more willing to make quick decisions.

Never talk about what you would like to do to the apartment. You may change your mind later, discovering that it's too expensive, not feasible, or just too much work. But if that was one of the features that sold the apartment to your new tenant, you may be expected to honor your word. A tenant can hold you to a verbal statement as well as any feature you listed in the for-rent ad and later didn't deliver.

Don't assure prospects that the apartment is “very safe” or “very secure” because you've put in the very best locks you can get. If someone breaks in later, despite the locks, you could be held liable.