We stayed in a hostel room in a separate building. The hostel was clean and well organized. Large full-ystocked kitchen, shared toilets and showers in each wing (four wings) and nice saunas in the lower level. When booking, we should have been told that everything is closed in the park at this time of year (everything opens again on 17 November) except the hostel. The restaurant was closed (so bring food or walk 3km to nearest store), the nature center was closed, the butik was closed. This would have been good to know when booking. Also, bring house slippers as you are not allowed to wear your shoes past the entry hall (a good thing). You can bring your own sheets and towels or rent them from the hostel (around 170 SEK).
Renovated in 2015, the hostel is a great way to see Abisko National Park as it's right at the entry to all trails. The train drops you off right across the street from the hostel and there are carts at the train station that you can use to cart your bags to the hostel.