Oh how I love this picture, so aware that though it looks like a simple room, it is anything but – unless of course you inherited it from your great-aunt in the first place.
The bath exterior is pristine rust with authentic texture – no-one painted that lime green in the eighties. The window is the original sash (double-hung as they say in the States), not Marvin, much as I adore Marvin windows. The walls are wide wood boards (try sourcing those), and the ceiling is beadboard which is not too difficult, but getting the cornice right could be tricky, as could be the wide skirting (baseboard). The door is boarded, with what could be original hardware (easy to get good reproductions!). Same for the hooks and brackets.
I think the lamp is not too hard to source, and the taps look new, but that leather sling stool is vintage as is the mouth-wateringly delectable old hand-woven rug. The wonderfully artless curtain was possibly hand-woven by nuns in Belgium.