For strobists a simple living room setup: Place your strobe on a stand and point it towards one of the upper corners of the room, zoomed in max. This way you get a pretty consistent lighting all over the living room (if not too large) coming from a nice upper angle, and zooming in keeps some character in the shadows (not too shadowless light). Best is if you have a large window and you can place the strobe in one of the opposite corners. This way you can balance the strobe and natural with even better results. Very simple but works like a dream for me.
My setup for living room size about 4x6 m: Strobe Canon 430EX, zoom 105mm, 1/2 power (= guide number 30m/90ft for ISO 100). Camera set to ISO 200 , f/5.6, and 1/30s to let some natural light enter as well.