We travel to Seattle often and Belltown is where we stay because of the easy walking distance to pretty much everything one would want to do in downtown Seattle. Being just on the edge of the city center, Pikes place Market, the waterfront, ferries, Seattle Center, etc makes it easy to walk to most of these while being an excellent value because of it's location. Everything else is a short Uber or light rail trip away. You are in the city so expect the usual sights and sounds but everything is so accessible. There is a Bartell Drugs right across the street that has pretty much anything one could need and a great little Italian restaurant next door for eat in or take out dining.
The apartment is perfect for a home base to go explore all that Seattle has to offer. A comfy bed and a shower with great water pressure starts your day off right. The building is secure and while we didn't avail ourselves of all its amenities (pool, roof top patio, parking garage) I'm sure they are great