I thoroughly enjoyed my stay. There was one tiny hiccup when I first arrived and the code did not work for the door. That was resolved very quickly with a 5 minute phone call to their customer support who was extremely helpful and friendly.
The place was very clean. The bed was comfy. There are no fans in the unit so it got a little stuffy at times with the heater on. The noise level that everyone comments on was present, but given the prime location that is not too surprising and did not detract from my stay. The views of the water were beautiful and the market is a block away which can't be beat.
If I were to return to Seattle I would definitely stay here again.