It may sound crazy but what is the orientation of these rooms (NSEW?) When trying to set up a media/tv room the one issue that comes up will be glare from sunlight. You also do NOT want that grand piano to be exposed to direct sunlight or any major swings in temperature or humidity.

My quick first impression is to have the piano room in the outer room with shades/curtains to control the amount of sunlight, the inner room has potential for the tv room with a second seating area for the fireplace. The big issue is that the two openings basicially cut the big room in half. You almost want to open up the wall between the two spaces to make a more useable single space.

when looking at the picture, the left side is east and the right side is west. although i'm planning to do room darkening shades / blinds / etc. to eliminate any glare or sun damage issues.

and yes, those openings are the problem. don't want to take down any walls so trying to figure out where to put the couch, tv, etc. within the current layout. thanks!

Here's a quick idea. I would get California shutters for the rooms to control lighting and dress them up with panels.

The piano can go to the smaller room, however, it would be so much better if you could remove one of the walls or transform into a half wall. That way you can show case the piano.

The fireplace part can be a formal sitting area and built-in book end of the wall could have a sectional and tv on a wall with a low, narrow shelf to keep the DVD player or whatever you need to house electronics.

Good luck!