I voted both the bedroom and other residental rooms. My most satisfying sexual experience was kind of a mix of both; it was a bed bunk in the living room of my lady's apartment haha. To be fair though, that bunk was a lot more comfortable than the bed imo!
We make our intimate time at bed room only because we need to make it unforgoten. We have to get time for shower, arrange toys, my wife selects lingerie and wears it, and other things. So, if we do all that in living room and some one suddenly knocking the door, then it will be a great mess