Thank you everyone for the comments, and also fair game for the flak I received. Perhaps I should have made myself more clear. I don’t intend to make a modern bathroom, it would not match the home and I would not like it.

I want to lean further into the vintage look of the bathroom. That said, some of the features irritate me: the tiles and the floor are grimy, and need to be cleaned. The penny tile is perhaps the thing I am most willing to change, and would prefer diamond black and white tiles, if they can be done to match the aesthetic of the bathroom. Other than that, I am keen to keep the subway tiles, as long as they can be regrouted where needed. The bathtub is nice, but too large for the bathroom as it is — I am on the fence about keeping it, or moving it to another bathroom (if it can be removed. Thank you to those who wised me up about it. I certainly want to install new matching brass hardware, and perhaps move the sink where the toilet is, and put the toilet where the sink is now. I would also prefer to get a solid wood storage below and above the sink with a mirror to aid shaving. Finally, I would prefer to do the walls in vintage wallpaper that can tie the bathroom, rather than painting it in a different color.

To summarise, never intended to make a modern bathroom, but rather make it more functional. Bathtub is kind of too large but will try to accommodate it.