@Laura2592 I've only hosted one other host, very recently, and she was a fine guest who left a 5* rating. She didn't mention that she was a host when she booked, but I saw that right away when I got her request and checked her profile. So I admit I was a little apprehensive after reading so many "hosts make the worst guests" stories, but that didn't prove to be true.
What I did find odd, though, is that she asked a couple of pre-arrival questions that obviously meant she hadn't thoroughly read the listing description (Would she be able to cook? I state in my description that guests have full use of my kitchen, as well as it being listing in amenities, and there was another question that I can't remember at the moment).
I have another host booked in for Xmas/New Year's week, so we'll see how that goes. So far his communication was great, and it was obvious that he had read the info provided. Both the host/guest I had and the upcoming have similar listings to mine, in that they rent a private room in their own home- maybe home-share hosts are more laid-back, less critical?
I honestly don't see any reason for a guest to mention that they are also a host when booking as a guest- it seems like it would be relevant, but to me it's not, since we know that there are hosts out there with quite dissimilar styles of hosting. Just because someone is a host doesn't mean they are necessarily not complainers by nature, have an entitled attitude, good communicators, friendly, etc. There's plenty of people who have a professional demeanor developed to impress their clients, when on a personal level you realize it's all an act.