I've got a similar problem.
I ended up treating the walls with an Auralex Roominator kit, which - though not optimal - was the best treatment to save me some space. When I first started working in the room, I noticed a whole ton of reflection problems..that's gone now. In fact, occasionally, the room can sound a little TOO "dead."
The recording desk is centered on one wall, and the couch is centered on the opposite wall. The other two walls are occupied by the V-Drums, amps, keyboards and guitars.
I've also turned the walk-in closet into a "vocal booth" with additional Auralex stuff, and some heavy blankets at the doors.
I do all instrument recording in the main room, and lead vocals in the closet. When I need more natural reverb in the room, for acoustic guitars and the like, I'll open the door leading into the tiled bathroom; again, it's not optimal, but it's the best I can do.
What I've found is that my straight recordings don't have a lot of natural reverb, but the tone is true..and I'll doctor it up with plug-ins and the like afterward.
On the desk, I've gone vertical - rather than horizontal. Staples has some desks that work beautifully.
I hope this helps. Drop me a line if you're interested in some pictures and further help.