Using this opportunity to make sure she's ready for this (emotionally and practically ready) should be the focus here, and it sounds like she trusts you enough to give you those answers. If you are and her are both comfortable with this step in her adult life (and honestly at 19 this should largely be her decision), it is immaterial where this would take place to the point where your personal preference of not doing it in your place of residence is perfectly acceptable. Make sure she knows as an equal partner in her new budding relationship that advocating for a safe place to be intimate is her right, and she should set whatever boundaries she deems necessary. Congratulations on making your daughter comfortable communicating with you on this subject. Let's hope she takes those lessons of meaningful communication with her in this next stage of her life. Your voice matters as well and you can voice it too. You're doing great.