Hi,
I live in Seattle, and here are my thoughts:
if you are willing to take the bus system (very easy, affordable, and safe- Seattle is a bus-friendly city, so you will find all sorts of people riding the metro) there is an excellent B&B about 30 minutes bus ride from downtown (ie: space needle). It is called the Greenlake Guest House, and it is where I send my family when they are in town.