Property was clean, dramatic inside, and provided everything we needed. For my wife and I, we just rented the downstairs, and in that case they don't rent the upstairs. The entire cabin is suitable for a larger family or group of friends (internal balcony overlooks the downstairs living room). We had a little trouble with the lockbox for checkin, but management was responsive and we got in.
Be aware that there isn't air conditioning. Normally it shouldn't be needed, with the location in a shady, forested area. But it was really hot the week we were there. Several good fans were provided, which helped a lot. (Bring an extension cord to put one in the window at the entrance for cross-ventilation - the fan cord doesn't quite reach the nearest outlet). Unfortunately, materials in the cabin suggested not opening the downstairs windows at night because of bears. We ignored that the second night and were much more comfortable. (The third night we had to close up again because of a nearby forest fire smoke and ash). We weren't impacted, but noted that the policy in case of cancellation for forest fire was reasonable - something to consider anywhere near the north cascade region.
All in all, a great place for my wife and I.
PS - we highly recommend the Mazama Public House as a place to eat. The restaurants at the Inn at Mazama (who manages the rentals of these cabins) are no longer open, and not likely to re-open.