Happily work, cook, sleep, and have had partners over.
Again, there seems to be an 'uncanny valley' of sizes where the feeling of inconvenience is overriden by simplicity.
In an apartment the size a US prison cell? You either have the measurements wrong or I'm calling BS on that, how do you even fit a twin bed in a 6m2 apartment? Do you shit in the sink?
Seriously, that's about the size of my bathroom. I certainly could have a smaller shower, but I'd change my tune if I had to sleep in it.
Just to give you my perspective as an Uruguayan (South American) software developer, whenever I visit the U.S. I think houses are ridiculously huge - most are bigger than mansions here in Uruguay.
I don´t have the same experience in Europe.
A twin bed isn´t a requirement for a single person. I lived in a 14 square meter apartment for 8 years, it´s not that harsh.