One of the houses that I looked at had a toilet that had been created by partitioning off a corner of the kitchen, the door opened directly into the kitchen.
I did a case where, when the client bought the house, the bog was in the kitchen. No partition. It also discharged straight into the field behind the house. No sewers, no septic tank. Just a big field of shit, and a lavatory you could sit on while using the cooker. Noice.
My flat is pretty open plan (!) so that's basically the set up I have. I'm just grateful I have a door to the bathroom - my friend has a sliding glass door between bathroom and living room.
Also this. In dreamhousethatweprobablywon'tget, trap #3 is just off the kitchen diner. Power play gold.