I've stayed in several over the years. As a single traveller I've only stayed in rooms in someone's house, a bit like a lodger really. The listing tells you what's provided. Only one I'd been to had breakfast included and actually I wasn't expecting that. It was a nice surprise. For me I like to be able to cook some tea, not from scratch cooking, easy stuff, and stuff that met my dietary requirements with no fuss, to be able to have crockery and cutlery for breakfast, and fridge space. If I got a take away a table and plate to eat it off. I have done budget hotels and rather resent paying the amount they charge for breakfast, I don't eat enough breakfast to justify it and on a special diet it's even harder
None of the places have affected availability of places for local residents, they have been people trying to cover their mortgage and have a spare room, or they are self employed and it is another string to their income bow. They have mostly been women, but not all, and that hasn't been a problem, I've been left alone. I've also spent time with the hosts where it seemed OK, and occasionally babysat a cat or dog while watching TV which was rather nice. I like to think I'm not too demanding, and don't come in late at night singing and having problems climbing the stairs, so hope I'm a good guest. Not had one I wouldn't go back to so far. You also meet some very interesting people, and see inside some interesting houses, and how other people decorste/furnish their homes. Your host can help you find out about buses, and things going on locally too.
I had a very u fortunate experience at a Travelodge last time I stayed, although I was paid up. Fully they had given my room to someone else, they had found me another room, quite a distance away, in a place I didn't want to be, having chosen original. Travelodge because it was near where I was going to an event, it's quite put me off going to one again