I live at 3rd Ave and Wall St in Belltown. I have lived here just short of a year and a half.
Third aveneu is where almost all the buses run, so it is a bit noisy. Plus there are lots of homeless people, low income housing, freee clinics, etc. So I don't recommend 3rd Ave area in Belltown. But it is just a 4 to 5 block walk to the Sound and views of the Olympic Mountainsso does have its pluses.
Because of Amazon in South Lake Union, just north of downtown, rents are going through the roof, even though they are buliding apartment buildings as fast as possible.
The downtown area ia full of students (Seattle University, Seattle Central Community College, and about three or four more in the downtown area.) That plus the Amazonians means there are a lot of young people here in the downtown area. Many of them are natives of Asia though, so that will be a cultural factor.
Capitol Hill is probably the place for you, if you work near or in downtown. It is sometimes More expensive than where I live in Belltown, howver. If you make a good salary, it will just be a matter of finding a place to rent that is available. Leases are usually for a year unless you want to pay much higher monthly rent.
Seattle has a great bus system and downtown is NOT friendly for cars (one way streets and high parking fees). If you don't have a car you will do fine. Busese run everywhere. ( I have a car - it sits in the garage most of the time and is used primarily to go to get groceries at the Safeway in Queen Ann (free parking there)).
I bike to the gym (when it is not raining) or walk and also to work. It is cloudy most of the time in the winter, but usually just sprinkles rain. It harldy ever pores, like with thuderstorms in the midwest of south. Most people just wear a jacket and don't use umbrellas.
Seattle has an amazing theater and music scene, probably the best of any city I have been to, including NYC.
If you like mountains, trees, and oceans and cool but sunny summers, this is a great place.
See if you can find a place not too far from your work and in the South Lake Union, Capital Hill, First Hill or Belltown areas.
I have just purchased a condo in north Seattle, so getting out of Belltown soon.
If you have any additional questions, let me know.