The Worst Room...

I have a garage.  Right now it is filled with saws, benches, tools, drills, grill,  computers and a tent for spraying finish.  The speakers are 7 ft off the ground.  I recently created FIR filters using REW and rePhase for use in hqplayer.  Really fine-tuned the sound.  Someday, I will have a proper listening room.  

@Jgoldrick 
my second system is in my wood shop, covered with saw dust. nothing better then building something while listening to some favorite tunes. 

My room is small and really bad. However, with acoustic panels and also software DSP (for digital only) via Convolution files (running on ROON Server). I have floor standers in the room and they sound excellent. 

I have a photo of the office room in my virtual system.

Surprisingly I have had really nice sounding systems in what most would consider terrible rooms. You can't always judge a book by it's cover. 

I have 6 rooms covered by 4 systems and 8 pair of speakers (one spare pair).

My best room is my moderately large L shaped room. Not just any speakers work well there but the Ohm Walshes in there were hand picked for it.

One is a big open unfinished area in the basement. Forget about the room acoustics. It is what it is and only used on occasion. My old personally refurbed Ohm Ls do duty in there mostly during table tennis matches.

Another is a big open family room/kitchen area. Again Ohm Walsh to the rescue.

Then 2 12x12s. One with Kef ls50 metas and sub is not bad. Not the best but not bad. The KEFs are superb in there. The other my wife’s 12x12 acoustically challenged sunroom. Vanatoo Transparent One Encores are as much speaker as that room can handle.

My newest is the screened in outdoor porch with vaulted roof and wall mounted Polk Atrium 8 s. Only a few listens so far but prettty good. A very unique room acoustically. The Polks are outdoor speakers and have a little extra in the bass which comes in handy outdoors where there is no bass reinforcement from room acoustics.