QuasiUnaFantasia I can imagine it getting loud in that room when the piano is sounding.
Yes, it's still a little loud, but not excessively so. In addition to curtains or Roman shades, we're also planning to add wall shelves with books, a slightly larger, thicker rug, pictures, a lamp, and so on. All of that will have a positive effect on the acoustics.
Vlad I see that the piano is exposed to direct sunlight - this is not good. I would highly recommend to install shades or curtains.
The room faces north - it only gets half an hour of gentle sunset light - in the summer. Don't worry. We plan to install curtains or Roman shades.
