Rental Mold Advice

Hey everyone, unfortunately for me I discovered some sort of leak in my apartment. My bathroom floor upstairs is stained and downstairs in the bathroom directly below mold is growing. I have put in a maintenance request but honestly I am freaking out a bit. Based on previous repairs, I have a feeling this will not be dealt with how it should. Any suggestions and/or recommendations? I don’t want to out the place yet since it’s only been a day, but I do know this unit had the same problem with the previous tenant. I honestly love the place. Thanks!