Here is a suggestion for giving tenants access to your home without the need for keys. We use these locks on our houses and they are great, no problems or issues. This lock system works with WiFi, so your home will need that (WiFi is only needed to program the lock, it is not needed for operation of the lock). You can add or remove up to 19 four digit codes into the lock any time, 24hrs a day, via a computer, tablet, or smartphone. For example we program in our renters code using the last four numbers of their phone number, we set the start date and time for the afternoon of their arrival, and the expiration date for the morning of departure. Once set up you can also add onto this system with other features, for example, when the tenant puts in their code, an inside light can be programmed to turn on so that they will walk into a lighted room. We bought ours a Lowes for $299, but I am sure they are available anywhere. Good Luck.
Shop Schlage Nexia Home Intelligence Satin Nickel Residential 6-Cylinder Electronic Entry Door Deadbolt with Keypad at Lowes.com