[A knight without armor]

Never heard of bed sit. Sounds like you describe a rooming house.

[snugs]

I guess so I think maybe we think bed sit sounds posher. Basically it is a bedroom but it also doubles as your sitting room as it is the only room you get. Hence bed sit.

What has become popular in recent years is private homes letting out a room to help out with house hold costs.

Often a single person will let out one or even 2 rooms to help with the mortgage. In this case it almost becomes like a house share but of course the owner is there so they have the last say in matters.

Sometimes couples will also let a room out after their children have left home sometimes because of money issues but also not liking the empty nest feeling. This is often the case in University towns.