Hello,
so, in my last apartment, I had a bathroom where there was a passage width of 40 cm between the wall and the sink (to get to the shower behind it). That was right at the limit of what is bearable, so I would say it seems rather too narrow. You might be able to get through, but for example, a pregnant friend of mine was there once and she had significant trouble getting through. So, better to avoid it if possible...