Maintenance is another important part of being a landlord. The appliances need to be kept up, the electrical needs to be in order, the heating and air conditioning systems need to be working well, and the plumbing needs to be in tact as well. For that matter, make sure you address any needs and repairs as quickly as you possibly can.
You need to take some responsibility for the safety of your tenants as well. For instance, in addition to providing safe locks, you should also think about smoke and fire alarms, security alarms, outdoor lightly, good parking areas, and even outdoor lighting.
The privacy of your tenants is important as well. Make sure you give them at least twenty four hours before you enter their unit.
As always, make sure that the lease is exactly how you want it and that it details payments as well as security deposits.