Desk IN FRONT of the book case wall at an angle - I wonder of this would be another option for the Mr.'s Desk or possibly other storage - like a trunk? I think it works here because there's enough room to access around it.
Love the exposed brick. Lots of shelving and good use of natural light. Also, the creation of distinct spaces (ie, the nook, the "entrance", the library/office area). I'm a big fan of spiral stair cases too. The only downside is the scale. K prefer much cozier spaces.