Its got about 50mm, to the wall, so should be OK. You would literally only see it from the shower so not in a prominent area. Overall I'm OK with it after seeing some examples. The tray is 1400 / full width and the shower screen 900 so I didn't want to centre it and potentially get more water into the bathroom floor.The niche is in a nice position I think the comment is about whether you've allowed yourself any at all for the tile. You could end up with a tiny slither of tile versus an inch or two (i.e. not much more, but enough to make it not stand out).
Im getting a tiler in so I'll see what they say re: niche.
I was going to try get nicer porcelain tiles rather than ceramic tiles I've previously had done.
Examples
Overall I appreciate the tiling on this pretty horrible