Another advantage of the ground floor penthouse is that there is no squeaky stairs to negotiate when well “socially lubricated” with ale.
Also, I have a 3 year old daughter, when we lived in a house, we had to have a stairgate across the stairs to stop her falling down them, now she can wander where she likes (often into our room at 5.30am)
I can’t understand why people don’t like something just because it doesn’t have an upstairs? If the rooms are of the same size as a “normal” house and you have just as much living space, you don’t have a stairwell/ upstairs for heat to rise up into to, why are they considered the equivalent of moving to Bournemouth?