Creating a little welcome package is something that will certainly stick in the mind of any new tenant of yours. It marks you as a thoughtful landlord and as someone who really cares about them as a person. Depending on what you include in your welcome package, you may end up saving that person quite a bit of trouble as well. Moving is stressful, as I'm sure you know. It isn't difficult for certain things to slip your mind, even if those things are super important. If you have a care package waiting for them with certain essentials, it can make the difference between a typical move and a (mostly) calm one.
Don't worry when I say welcome package, I certainly don't mean you need to put everything in a little basket. Although that may be sweet, simply resting things on a counter or even on the floor can be perfectly fine. Think about things that you would be likely to forget when moving. Things like toilet paper are essential but are an often forgotten item when someone is changing their home. Leaving a new roll somewhere in the apartment, or even on the holder, can be something that is greatly appreciated. This is especially true if your resident has a long trip and doesn't think about their actions due to a bursting bladder.
Having some cleaning supplies in the apartment can always be helpful. Even if you have cleaned and scrubbed every inch of the place, some people simply prefer to do it themselves. Even if this isn't the case, moving can get messy so have some solutions for your new resident.
Food and drink is normally quite a mess the first night or two. Leave a gallon of water in the refrigerator and a couple of takeout or delivery menus in the kitchen. Maybe you can even score your new resident some coupons.
Anything you can do to help someone move is always appreciated. A care package is the perfect way of showing that you care about your new tenant.