We had a nice stay at Dirk and Jackie's place. They answered our questions, the place was tidy and very well located. We also appreciated having some guidebooks about Seattle in the apartment. We were however very surprised to see that the place is located right next to the highway and is thus very noisy. We had to sleep with earplugs. Besides, we didn't really appreciate having to pay an extra $45 just to be provided with sheets for the sofa bed, considering there was no extra guest and we just didn't want to sleep in the same bed. Also, the pictures make the place look much nicer and bright than it actually is.
Overall, the apartment is ok if you are looking for a place to stay for one or two nights in downtown Seattle, but we would not recommend it. I'm pretty sure that you can get something better and much quieter for the same price.