I originally was hesitant to book for two reasons - the proximity to the highway, and how lumpy the bed looked. Both turned out to be non-issues. I did a decimal reading at the house it was averaging 48, and if you are under the highway it was closer to 68 on average. Traffic could not be heard at all with windows closed, or if the windows were open and fans were going. Sitting outside on the porch you could hear distant traffic, but not enough to interrupt conversation. The bed was not lumpy as it looked in the photos - it must have been the old comforter as this bed was very comfortable.
This unit is in great condition - everything looks brand new and it is clean. The decorating style was
simplistic but sophisticated. It was in a nice location for us as it was far enough from downtown to avoid the noise (and smell), but it was only about 10-15 dollars for an Uber to go downtown. There was a parking spot designated for our unit but we never used it and opted for Uber's - not only avoid payment for parking elsewhere, but to get where we wanted to go faster based on the knowledge of someone used to the area. If you stay here the French bakery Le Fournil is only a 3 minute walk away and they have the best pastries and coffee that isn't overly sweet. Also, eating on the outside barge at Ivar's Salmon House has a splendid view of downtown, has great food that isn't overpriced, and is only a 15 minute walk across the bridge (there is a pedestrians path). Dennis was easy to get ahold of when we had an issue getting into the unit. He also answered questions I had after booking to help me with my planning efforts (thanks again for letting me know about thestranger.com where I tracked down one of my favorite artists who were playing locally while we were in town).

The only draw back to this place was that while we were there it was warm (mid to upper 70's), and it was difficult to get the unit cool before going to bed since there was no air conditioning. There were two fans, but they would only moved around the warm air.
I am not sure if my adventures will have me returning to Seattle anytime soon, but I will definitely keep this place in mind if I come again.