We call this the "shaving sink". It's not really a bathroom & not really a powder room.
I have named the quirky little spaces in our house. We have a "utilities cupboard" which is a disused shower & a "service porch" which is the little 1m square area outside the kitchen door. It makes the ranch sound pretty grand doesn't it? I can assure you it's just a 1960 cream brick.
And another thing... the photo on the wall isn't me. I can only dream.