Dark Edges on imported models, Water Material Type, HDRI Map quality

Hi Jan,
Thanks for getting back to me and answering my questions even without images.

This is the scene i’m working on (its in its very early stages, i’m basically still testing to see if it’s possible)
https://sachaandraos.shapespark.com/space/

You’ll find the water in the first room to the left once you go up the stairs. You’ll see its reflecting the top of the sofa rather than the bottom.

Do you have a fix for the dark edges around some pieces of furniture? Would that get sorted in a smaller scene with therefore a better resolution? This is the one thing really holding me back at the moment and it would be great to know how to proceed.

Thanks a lot for looking at this.