In Europe, on the Continent, standard sizes are 180cm by 2m, and 2m by 2m (or about 78.75" by 78.75"). When my wife and I lived in Belgium, we bought one of the German 2m by 2m beds, which was quite expensive. But it was still the best bed we've ever had.
Here in the US, we were able to find a store here in Austin (Austin Natural Mattress) that helped us find a solution with three separate layers that can be replaced as necessary, and design the bed to our exact requirements. This is the closest we've ever found to our beloved German 2m*2m bed, and since each side under the top mattress cover can be replaced as necessary, we each get to choose how hard or soft we like our side, or how cool or warm we like our side.
Given our recent experience, I would never again buy a bed that did not let us choose individually how we want our side of the bed to be.
Here in the US, we were able to find a store here in Austin (Austin Natural Mattress) that helped us find a solution with three separate layers that can be replaced as necessary, and design the bed to our exact requirements. This is the closest we've ever found to our beloved German 2m*2m bed, and since each side under the top mattress cover can be replaced as necessary, we each get to choose how hard or soft we like our side, or how cool or warm we like our side.
Given our recent experience, I would never again buy a bed that did not let us choose individually how we want our side of the bed to be.