Last bathroom I did was 3yrs ago and was pretty small, about the size of yours. My wife and I inherited a rental condo from her grandpa when he passed, we didn't even know about it. Apparently the previous tenant was there for like 20yrs before we evicted her for not paying rent and destroying the place. She and her adult son turned out to be quite mentally disturbed and semi-hoarders. I've walked through all sorts of houses with my dad, who was a kitchen/bath contractor before he died - this place was by far the worst living conditions I've ever seen humans living in willingly. I think her water was cut off for months, but they couldn't shut off the shared hot water to the whole building. There was only a trickle of water at the kitchen sink, so naturally the one upstairs bathroom was the logical place to "wash your dishes" - literally a little catwalk in the bathroom through the funk so you could "bathe" in the 2sq foot of clear out bathtub space, because the rest was piled with dirty dishes. They were using a pot to ladle water from the shower into the toilet tank for flushing. I would have liked to burn the place down if it wasn't attached to other units.
There was water damage all over the bathroom, holes in the wall, nasty 4" tiles falling off the wall (old school tile on drywall) - so basically I had to redo almost everything....and it was the same month I was moving into my own new house and trying to get the old one cleaned up to rent out. Was going to use an acrlic insert for the quick and dirty, but tile and new tub was somehow cheaper - and much nicer looking. Any drywall I replaced was purple board instead of green, for the mold/mildew resistance. New copper and valves soldered in. Tile set over hardiebacker w/felt paper underlayment. I used some 12x24 porcelain tiles I found at HD Supply because they were nice enough to use in my own house, cheap, and less grout lines (epoxy grout). I forgot to get the stainless edge molding and was in a rush to get it done, so ended up just skipping it and caulking the edge - looks more than acceptable for a rental. I think I used an IKEA vanity/sink combo because I needed something really compact. Even the toilet had to be compact due to how small this bathroom is. Would have flipped the door swing direction, but it was even tighter that way. I think it came out pretty good especially considering what it looked like before.
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