It's my cellar. The basement. Or, as they would say in Arsenic and Old Lace - "Panama". I'm lucky enough to have a decent sized basement to allow for the brew equipment that I have acquired so far. As anyone in this 'hobby' knows, however, the equipment tends to pile up rather quickly!
I use the laptop to work on recipe formulations, unit conversions, pitching rates, etc. The coolers are use in the "Batch Sparge" method, and you can also see one of the corny kegs.
The guitar is an important part of the brewing process, as it helps to pass the time for those moments in between steps. There is also nothing like sitting down to drink a pint of your own homebrew while plucking away on the old six-string. I've got a couple of guitars, but also have a Ukulele and a Mandolin.
I also have a couple small speakers hooked up to my computer that pumps out music during my brew sessions. There is nothing like a little Pearl Jam or White Stripes to help get your brew on...
The basement has walkout stairs directly to outside. I use this area to boil the strike water and wort. I think I read somewhere that it is dangerous to brew in the basement with propane if you don't have an exhaust fan (something about fumes and dying). I use to brew in the garage, but that wasn't great because I needed to hump all the equipment and liquids all over the house and up and down stairs.
This works out just fine, though. There is a drain right underneath - which comes in handy with boilovers or to discard water or trub, etc.