I would begin by turning the piano around and angling it so the bench is essentially in the arch. Then I would put a chair and table with 3-way light in the right side alcove of the FP. Next I would put a love seat on the left of the FP with a matching table and lamp in that alcove, plus a coffee table in front of the LS. Put a round table and 3-way lamp at this end of the love seat. Add another chair next to it, facing the FP. Run your extension cord, for the lamp under your love seat. Finish it off with a beautiful area rug that is large enough to allow all the front legs of the seating pieces to rest on it. I hope this helps and fits.It is hard to say without measurements, but I have some idea, because I have dealt with large pianos all my life. Oh, and put a good piano light or floor lamp or both, in the front right corner, next to and on the piano. Good luck.