Oh, this makes me excited to read!
I'm not sure what your specialty is, but I just spent 6 months in their ED. It was my first assignment, and I extended because I loved it so much. Their ratios are dependent upon acuity (3, 4, or 5:1), they'll work with you if you have a tanking patient, they have float nurses, you get breaks and lunches, and the staff are amazing. (I'm still friends with many of them and received a glowing recommendation from a shift supervisor.)
I took the housing stipend because I actually wanted to go for Seattle and most definitely didn't want to be stuck outside of it on my days off. I spent my first contract living in Seattle proper (a 25 mile drive that was easy to do for day shift). For the second part, I moved in with a co-worker who lived in Mt Lake Terrace (about half way between Seattle and Everett). I saved a ton of money, but I didn't like being out of the city, so I wouldn't do that again. (I care more about the city experience than proximity to work.)
Weather is important to consider. I went for the cold, gloomy rain. Of course, I didn't realize it'd be warm and sunny in the summer, which is part of why I'm happy I extended. That weather isn't ideal for a lot of people though. Seasonal Affective Disorder is very real, so keep that in mind.
Overall, it was an amazing place, and I'm looking forward to going back! Feel free to PM me, if you have any other questions.