Meeting my soon too be step daughter

Tamika • Hi I am a single mom of 3 kids, I have 2 boys and a girl.
So my fiances kids finally decidedto start talking to him again since his ex wife filled there heads up with bullshit. I met my step son i love him and he loves me. But i never met his 16 year old daughter she texted him as long as ya fiance knows her place like he didnt say this is her house all he responded was she knows she is not your mom i feel uncomfortable with them staying in my small 2 bedroom apartment but at the same time i dont want him and the kids in a hotel for a week please help me out. Im excited but my rules aplly i had the appt before he moved in now its our appt we are both on the lease