First off, Sheldon is a great host. He was very accommodating when we requested an earlier check in time and overall very accessible yet not overbearing. He provided us with bus schedules, and personal restaurant choices (my boyfriend and I were pretty much on a foodie trip)--even Sheldon's girlfriend made a nice list of restaurants with descriptions and all.
Now onto the apartment: It was very clean with plenty of blankets, towels and traveling essentials (shampoo/soap etc). Seattle a lot cooler than we're used to but if you turn the heat on and bring out the space heater it wasn't bad. The only negative thing was the bed. It was a bit uncomfortable for me because with every movement there'd be a loud squeak. I mentioned this to Sheldon, who promptly asked whether I'd like the bed flipped. It wasn't a huge deal to me because the couch is ridiculously huge and comfortable so I crashed there instead.
All in all, a good experience.