You may want to find a real estate broker who will help you with your search. if you'd like, I can send you a wonderful book on the Seattle area and it's neighborhoods.
On my web site, if you set up a search, there are links upon which you can click that give you great lifestyle demographics. Welcome to Seattle. You will love it here.
We can help you find a rental when you're ready too!
NE 13th Place is just off a main road, close to shopping, but far enough away that it doesn't feel commercial. The houses are nice and the area just south of there, Kelsey Creek, is undergoing a huge renovation.
140th SE could be any number of places (Bellevue street numbers can be confusing), but it most likely you are looking around the Lake Hills area, which is further south of NE 13th Pl. Lake Hills is an older established neighborhood with mostly quiet streets.
If you are moving here to work with Microsoft, Lake Hills will be a about 10 minutes more of a commute.
If you have children, the Bellevue school district is top notch and the convenience to shopping in both these areas is excellent.
I hope this helps. If you have any other specific questions, I'd be happy to answer them for you.