Been to Chamonix twice and stayed here both times. As it seemed to us in a small (at first glance) room - only 30 sq. m, thanks to an interesting system of mobile transformation of space and the presence of a separate bathroom (quite small in size), four of us can comfortably accommodate.
It's hard to call it a hotel - it's 100% apartments: you can comfortably accommodate four people, a small but comfortable kitchen, a separate bathroom (normal size)