The only space I was able to claim for myself in my house was this little 6' X 10' "niche". Well, it was this or the garage, so needless to say... Because of the space limitations I decided I could not move forward without working on some sound acoustic treatment, specially to address 'clap' echo and reflection. I was not concerned with bass as I purposely selected a monitor based speaker with a lot of character but not significant bass - the room helps amplify the low frequency in a more controlled fashion without becoming chaotic - the acoustic treatment brings a delay in the room natural resonance.
I listen to a great variety of music, but fundamentally jazz and 70's progressive rock. The system combination has proven to provide an almost magical experience - very intimate and with a lot of liquidity.
The decoration was a conceived with the whole system set up, my wife and my sister were the ones who designed the room, taking my functional requirements.
Amazing! I have never seen such a small listening room - but the way you and your family designed it - it seems like a great place to escape and just get enveloped in the music. Great job!