I am very happy with my listening room.
It’s the front room on the main floor of our house, which would traditionally have been the living room. We started with it furnished as a living room with a sofa on one side and two big stuffed chairs on the other end near the bay windows. However I co-opted it as my two channel listening room early on. (it was going to be one of those “ living rooms” that nobody actually does much living in otherwise).
Even back then, possibly due to the odd shapes given with the bay windows as well as a large opening to the hallway, and a suitable amount of furniture, the room sounded really good. A few speaker manufactures who dropped by to listen we’re surprised how good speakers sounded in the room, even big ones.
Nonetheless, I got the Home Theatre bug and the only room I had at my disposal was the same room. I wanted it renovated for use as a Home Theatre with surround sound, but also maintaining my separate two channel system. I hired an architect and an acoustician to help renovate the room. There was quite a bit of room treatment involved (though made to not look like room treatment) .
In the end, it came out sounding better than ever.
Of course it’s not absolutely perfect. It doesn’t totally solve every issue in the bass frequencies. But even there I’ve got smooth enough response to satisfy me, and generally sound reproduction is wonderful in the room.