If you have an internal manhole/inspection cover within your tiled floor it will not be be prettiest of features!
It's "sod's law" that will not be square with your tile layout and will be in the most prominent position in the room; as some of the photos below illustrate.
I do my best!!!
There are is usually a way to get around these problems.
- Moving the frame/cover to line up with the tiling layout
- There is always that feature rug!