We have the black mirror splashback. We love it and it soooo easy to clean

I found this photo online, perhaps it will help. In this picture the crown molding on the cabinets flow from the kitchen to the adjoining room. Maintaining continuity with the color and some of the trim detail will make the rooms transition nicely. Don't overlook the details like hardware finish, lighting and plumbing fixtures as these elements can also tie the two styles together. I hope this was helpful.

I do not have any tiles in my current house but if you think about grout discolouring and looking bad.... then I think that might answer your question. My thought - the less grout the better.

I've always had a tile and glass shower and it's a bit frustrating to clean. However, like you, I love the look of tile and glass so I deal with it. What did you decide to do?