Well most of the Downtown Core is heavily corp and Luxury or High lifestyle, or AAA or AA. Moving north in to Ballard is an option for High Lifestyle. Market Street is the main East-West street, and 15th ave NW is the main North-South arterial. Another Neighborhood to consider is Edmonds, further north. Ballard and Edmonds both are waterfront areas and are mostly residential, ballard has a gentle uphill rise from south (the ship canal) to North, Edmonds is ringed by hills. For the safe house, a low key, out of the way area would be Snohomish, it does have the draw back of being about as far way from Downtown as you can get without being in the Salish Territotry. Even in some of the Canon material the area is still described as rural and houses much of Seattle's remaining agriculture.
Info on Ballard