Dating someone with kids

I've been dating this guy for almost 7 months and it's going great. He has a daughter who just turned 4, and I adore her. She is his world and she's becoming mine too. We are in the process of getting a place of our own, right now we are staying in my aunt basement. We are in one room and have her on the weekends. This is the first time I've been at this level with someone and I'm wondering if I could get some advice. His daughter has been sleeping with us every night we have her. She won't sleep in her "big girl bed". Is this normal? I didn't mind ever once and a while her sleeping with is, but every night?! I feel like it's getting a little out of hand. I'm not sure how to approach the situation. Do I just hold out until we get a place?