Please help! I'd like to paint this bathroom

Hi there! Yep, you can definitely paint those walls but I would give them a light hand sanding first to make sure your paint really sticks and, yes absolutely, use a primer and paint specific for bathrooms and wet environments. I think to make it a little more modern you might consider replacing the seem covers with 1x4s or, I believe its also possible (though a bit a pain the but) to cover those seems with sheet rock tape and mud to eliminate them entirely before you paint. In fact a light coat of sheet rock mud over those walls would really help your paint adhere to them as well and give it a much more modern look.

As for the floor, I would remove what's there and yes, absolutely, new stick down tile should work great! I've used that product several times and my advice would be to make sure and clean the subfloor really well before hand and use a vinyl laminate glue. I know the stick down tiles should "stick down" on their own but they really don't. Use a glue too to make sure they last.

You can do it. Clean well and use oil based paint.

Prime the walls and trim with a good primer. I like to use Kilz or Zinseer. Then paint with regular wall paint. It would be hard to remove to metal trim without possible damage. Basically it's an "H" channel the bath panels slide into. If they were plastic or wood they could be cut out. Peel and stick tile or planks will work on the floor with no problem. They can go directly over the old flooring. Just make sure it's very clean.

Hi, I hope you are doing well.

Melamine are composed of multiple layers that should not be sanded through. But you can do the next best thing: resurface the laminate or melamine with a quality paint job. An acrylic primer would be best.

in order for the melamine to properly adhere, the surface needs to be cleaned, sanded, and primed with a primer that's designed for melamine or for laminate wood. Use TSP to clean the surface and use 150-grit sandpaper to rough it up. Then, apply your primer. Make sure you get a good bonding primer, such as Kilz or Zinser 123.

Do you know what surface is behind the melamine? If it is glued down or loose laid? Bathrooms are not large areas. I hate melamine. I'd get rid of it even if it means bashing out and installing drywall so you have a smooth surface. Stick tiles are great - just get a good quality so they don't have to be glued down. Or you could lay ceramic tile right over top of existing. Depends on your budget. But bathrooms add value to your home in view of future sale. You'd recoup the money.