My husband and I stayed three nights in Dan's Alyeska condo and enjoyed it very much. The condo itself is updated with expansive views of the mountains from the living area on the main floor, the main bedroom on the second floor and, of course, the roof top terrace. It had a nice, well-equipped kitchen and comfortable living area. It also had a cute bedroom for kids, with bunk beds and a loft sleeping area, which we did not make use of. Things to note for future renters--the bedrooms are located up a sturdy spiral staircase, as is the only bathroom (with a whirlpool tub, I might add); the roof top terrace is also accessible through this level and is a large area shared with another condo.
The only negatives I can think of is that the exterior of the building looks a little worn, but I imagine the the winters there are pretty hard on the paint and decking. The one other thing was that the pay washer in the lowest floor of the building (one of the reasons why we stayed there, so that we could wash clothes on an extended vacation), has a "load sensing" feature that did not function properly. I put in 3/4 of a load of clothes and it only filled about 1/4 of the way that it should, leaving us to cart extra water down there to fill it up to the point where it wouldn't damage our clothes. That's something that should be brought to the attention of the maintenance people of the building.
Dan, our host, was very receptive and helpful with questions and prompt in sending us the information in how to access the building and condo. And the condo was very clean, something that's important to me. Overall, I would definitely recommend the Slopeside Condo if staying in the Girdwood/Anchorage area!