It's bonkers.
There is a proper bedroom with an ensuite bath (bath not bathroom) that you can only access by going outside. So to pee in the night you would need to get up. Put shoes and a raincoat on. Unlock the patio door and then enter the main house.
The mezzanine bedroom appears to be completely open. No risk of falling off at all! And no privacy if anyone was in the main area of the house. It also has severely limited head room.
Kitchen look pretty impractical. They've put in a tiny hob with downdraft extractor and I can't see an oven or microwave combi. How big is the fridge?
i seriously hope this is an amazing location as it is a very odd house to be asking 375K for otherwise.