Tenant renting out unit on AirBNB?? - St. Louis

[Adam Horvath]

I own a duplex in Tower Grove. (St. Louis MO) 

Over the weekend we found out that my tenant had been renting out her extra room on AirBnB. In her lease it clearly states that this isn't allowed, and this morning we sent a text verifying that this must be stopped immediately. She agreed. I don't trust that she's going to stop right away, as she stated that she has quite a few weekends already booked. 

Has anyone had this happen? I'm buying camera's currently to help track the traffic that comes in and out of the house. (want to verify that not all guests are showing up with suitcases etc)

We found out this was happening because a man walked into my unit thinking it was his AirBNB and it was just my girlfriend home. You can imagine that this worries me as I don't necessarily want strangers in and out of the residence all the time/even have to worry about this. Heck of a ride so far for being my first property!  

Has anyone personally ran into this?.. Would love some incite. 

Thanks, Adam