I don't know what the laws are like where you are, but it would be a good idea to find out whether you're leaving the home would legally be considered "leaving the marriage". If so, you would want to draw up a mutual agreement with W saying you both agree that you're not leaving the marriage, just maintaining separate residences.
That said, I know that in my sitch I'd probably jump at the chance to get my own place, and for exactly the reasons you mention.
Is the other place liveable? Could you fix it up? Maybe you could arrange to pay less rent, at least for a few months, and you can use the money to fix the place up a bit. They might go for that because they'd have the place rented and they could get more rent later after it's been refurbished a bit.
M41 W42 M 12 T 15 S10, D9, twin Ds 3 1/2 BD 1/2/2013 Living as roommates Working on D agreement w. mediator 5/13
