For one person 20m is pretty common unless you wanna expend a fortune.
I have a friend moving now to a 40m one and pays 150000¥
I would have no problems with that, we are pretty well trained here in London in small flats and horribly expensive rent
I guess I will "worry" about it, when/If the bosses of the company where I am working now will agree to my relocation there.
...or when I will quit this job and become a teacher.