I feel somewhat qualified to comment on this question! /grin
I would definitely recommend getting pool heat in December, it's well worth it to have a nice and warm pool, we recommend it Oct-April to people.
I've stayed in a few different townhomes in WHR and also own / operate a few there, and I think all of the locations of the townhomes are pretty good, and mostly quiet. We rented there 2 years in a row and loved it so much we bought a place there!
There's no busy roads nearby, for one thing, most nights it's a very peaceful, quiet kind of place, the one exception might be if you had some noisy neighbors or something but that's not dependent on the location.
I think it comes down more to amenities / features, things like decorating, electronics, beds, internet, etc, and of course price, all of which vary slightly from home-home.
GREAT place, you will love it! Most people come back and say it was a lot nicer than they ever expected, and have just a wonderful vacation! It's one of the newest, nicest, and closest resorts to WDW at the moment, and has a great reputation and is one of the "hot" resorts to stay in at the moment.
Please let me know if I can answer any other questions or help in any way.
- George