ok... here's a short resume
system: 4x2,25 Ghz + 2 Gig RAM
SL: 17 at 14hrs
the whole apartment was build. so there are more rooms connecting to each other... so no removed walls.
first of all I always render with ML.
so I decided to use planes as emitters in the windows - and a hdri as sky (skydome would be also possible).
by that I can controle the brightness of background image and emitters very precisly. the physical sky diffuse light in most cases is too bluish and clears up to late for my use.
also theres a emitter faking warm lights coming from living room next to the kitchen. in fact this light lies a bit behind the kamera next to the pictures on the wall to the right.
the rest of the lights f.e. the lamp and downlights are visible in the pics...
thats about it...
if this wasn't clear enough I'll show you an overview of the scene tomorrow... (I'm not at work atm

)
greets