City villa floor plan / window arrangement, feedback desired

No, there is nowhere a sloping ceiling there, alternatively there would be a 1.70m tub but that was actually not the plan. 276cm is the shell construction measurement, so there is some room left for plaster and tiles, it will probably be a tight fit.

Should still fit. What kind of niche is pushing the tub to the left as planned?

There the ventilation and technology go down or up. Actually, the whole bathroom should be 276cm wide. This niche was created basically to have a shelf behind the washbasin in the bathroom, similar to a pre-wall installation.

The ventilation ducts are already embedded in concrete, so nothing can be changed there.

But you still have to subtract the interior plaster from your 2.76m.

Best regards
Sabine

You can make a deeper platform behind the toilet, which brings the toilet forward. A 1.70-meter tub would not be an option for me.