Re heat, there's a vent near the bay window, I will close it. That's what I do in my current piano space.

So, Shawarma_Bees made this visual for me and posted it at PW, it's super helpful to see it. I think this is the diagonal you mean, and it's what I'm thinking will offer the best acoustics.... The question is, will it look ok, and will the room look/feel too small that way...

    ShiroKuro BTW TwoCats, my main concern isn’t so much the appearance but the acoustics.

    I meant that angled is good for acoustics (I always angle if possible) but also looks fine on the rug!

      ShiroKuro Yes, Shawarma Bees has illustrated what I tried to describe although I might have tried to achieve 45 degrees and get the left hand side of the keyboard nearer to the window. There does need to be space to be able to withdraw the action; 20 inches I think. This adjustment should release some of the space in the room.

      PS When I was thinking of putting a grand piano in my dining room I used Floorplanner.com to explore the best position. It was relatively easy to use.

        I've been using floor planner for the past hour now, I find it hard to get it to do what I want it to do. Probably I need to play with it more.

        Anyway, here's my attempt at one layout, with my rug. But the floor color doesn't match, so I don't know how helpful this is...

        here's the straight positioning...

          ShiroKuro Well done for getting floor planner working. Both your layouts look good.

            ShiroKuro I prefer to angle it more like this (pretend the lines aren't there). And if the heat vent is leaking air you could put a piece of foam in it.

              Or like this against the left corner! This is how my piano is placed and I really like it, especially how the "thin" side of the piano tapers into the room. I can take measurements of how far I am from the wall if you decide to go this route!

              My piano has one leg on a rug and two off. I dealt with this by putting caster cups on the two off and leaving off the cup on the rug leg. You don't have to have the piano in the "middle" just because the rug is there!

              In the angled one I made, I set the angle so the straight edge of the piano is parallel to the doorway opening. It's hard for me to visualize the difference with your suggestion.

              Also, thanks for suggesting angling the other way, I quickly made two more versions:

              Because that lefthand wall is the shortest wall in the room, I don't think it will work. In order to have enough room for my bench, I'd have to push the piano's tail into the bay window bump out, which I'd rather not do. Maybe... I'll keep looking at these and thinking on it.

              Any other suggestions are welcome!!

                ShiroKuro In order to have enough room for my bench, I'd have to push the piano's tail into the bay window bump out, which I'd rather not do.

                Ooooh I actually like the placement of the piano taking advantage of the bump out so that it takes up less space in the room, but then I think it should be rotated the other way for acoustics. And you definitely need some kind of window treatments (but even thin gauzy sheer curtains could be pretty and keep the direct sunlight off the piano).

                Edit: hmmmmmm maybe not enough room to rotate unless you made it parallel to the bay window? But possibly could scoot it closer to the window off the rug? Interesting because you still have angled walls to liven up the sound reflections.

                Edit #2: I think my preferred position is probably parallel to the angled back right wall in that corner with the keyboard sticking a little off the rug, to have more space in the rest of the room.

                  ShiroKuro Just from looking at the pictures, I like the straight positioning the best. When you enter the room, there is this nice option to sit in the lounge chair or on the piano bench.
                  My thinking is also that the room has enough angles and that the straight piano will provide some balance.

                  *
                  ... feeling like the pianist on the Titanic ...

                    Animisha, the straight position is definitely the one that makes the best use of the space...

                    Twocats, so, I'm an idiot... the room I designed does not actually replicate the room itself. Take a look at the real room:

                    The bump out isn't as roomy as in the floor plan I designed. Oops!! Oh, and those are the curtain (I just got them so haven't ironed yet), there are mini blinds and the curtains are lined black out drapes.

                      ShiroKuro whoops! I still think the back right corner is preferable (angled mostly toward the back), and maybe take advantage of the bump out for having a little extra space to pull the action!

                        Someone else pointed out that the angled placement allows more of the window to be seen, and preserves some depth of the room, which will make it seem bigger maybe

                        How about angled but where the chair is now - in that corner - the piano would open up to most of the room that way

                        Do you mean like this?

                          When I was thinking of exchanging my upright for a grand it was difficult to know where to place it so that it would be easy to approach both the bay window and our dining table at the same time. It has recently occurred to me that if I placed a grand on dollies the piano would be moveable by one person so that any position I had it placed in could be changed.

                          ShiroKuro yes but with the tail the other direction toward the open doors- so that the piano opens up out to the room toward the window so you would be sitting facing the open doors with your back toward the wall