Thanks for posting about the hotels, I didn't realize it but it's good to know some actually house them. I am always cautious anyway because you never know who is in the hotel with you but them being so familiar makes it more scary I think.
As for people living in the house, I had my own bad experience as a kid so I always speak with all parents myself, tell them who lives in my house then ask who will be in the house with my kids. If there are any older siblings in the house I do not allow sleepovers and tend to do more visits at my house and here's why. When I was about 14 I went to sleepover a DF's house. I knew this girl since I was 10 mind you, but was really growing to be more... how can I say it delicately... feminine. So anyway, I sleep over and while I'm there her 24 year old ENGAGED older brother decides to hit on me. My DF made herself scarce and I found myself alone downstairs in the kitchen with someone who plainly had designs on me. I was too young to really get what he was up to but I could sense trouble because he wasn't talking to me like I was a kid. He was asking if I wanted to go see a movie, if I liked Chinese food, did I have a boyfriend, what my curfew was, did my parents work... all sorts of weird stuff. Well, luckily the Mom came up from the laundry and I took off for my friends room and didn't step out of it until it was time to go home the next day. I never went back and I never told anyone about it either... it was one of those things where I knew but didn't have proof so I never spoke up.

Now I wonder how many of my friends other friends had the same thing happen to them? I know this guy was never convicted of anything because I would have heard about it. Also, after this night there were a few times when my DF would call me then hand the phone over to her brother... VERY CREEPY. Now she was the same age as me so she probably had no idea what he was up to... or maybe she did, she had a huge crush on one of her brothers friends and I often wonder if maybe it was more than that.
Personally, I have too many stories like this of my own and from friends to count. Because of them I tell my kids #1, that if they feel funny to listen to that feeling, and #2, I will always believe them no matter who it is. Most people are fine but some are just so twisted