I was thinking “it cant be that bad”

An article on tokyo apartment sizes and layouts

Relevant part:

Tokyo’s micro-apartments are famous worldwide. Some studios are under 20 m² (215 sq ft) – indeed, over 1.4 million households in Tokyo live in homes smaller than 19.7 m² (212 sq ft)! These tiny units often feature a single multi-purpose room, a unit bath (compact modular bathroom), and a small kitchen. In extreme cases, a few tens of thousands of Tokyo residents live in spaces around 10 m² (≈107 sq ft) – essentially a single room without much extra space, measuring about 95 sq ft of usable area. Due to the high population density and limited space in large cities like Tokyo, these compact living solutions have become common, especially for many young people and single professionals.

In any case, <20 m² is the lower end of the distribution. The lower end in my country has to build favella like living places.

Ooh. 10 times more cleaning area to ignore…