The best thirty minute refresh? Take out every single "small". I mean the throws, the table top doo dads, the twenty candlesticks, the stale papers and magazines, the drooly pillows on the sofa. Take out the granny coasters that littler every table, and that pink kleenex box left from last weeks head cold.. Put all the remotes in a basket. Now.....put back one third to one half, and only what is necessary. Ask how you could creatively hide the "necessary but extremely ugly". You won't believe what ends up out of the room. Now, treat yourself to a five minute dust and vacuum, and when you head out to the grocery, grab three hefty bunches of fresh flowers (one kind). You'll be amazed.