Great stay in the Generator Hostel. Spent 5 nights there in a 6-bed mix dorm and felt completely safe and comfortable (I'm female). There were a lot of space to keep your things and a lot of ground space as well so you don't feel too cramped. There were also a lot of hooks for hanging space but you only get 1 clothes hanger. There was a shower+toilet cubicle in the room and was very clean. The entire building was neat and clean as well as nice and warm (I stayed in the last week of December 2019; temperature outside ranged between -6 to 8°C). There's an elevator, it's a bit small but would fit 3 people with medium-sized luggage. The reception literally is 24-hours, check-in was smooth and fast despite arriving at midnight, although I had checked-in online before I flew in. I checked-out at 5am and there was someone at the counter, friendly and nice. Asked me if I knew how to get to Arlanda Express (7 minute walk, all the way straight except 1 turn where you'll see the Generator building). The location was great, close to loads of good restaurants and bars and 7-eleven just across the street, 10-minute walk to the city centre. There were lots of posters up on the walls for traveling tips that were helpful. The Generator also has a cafe-turn-bar-at-night in house that doubles as the reception as well. Open till midnight I think and has daily activities except on Sundays but would still be open. When I was there, it was IIHF hockey season and they played the game in-house which was pretty cool. Also bought a token for breakfast but didn't get to use it as I kept waking up too late lol so can't give my 2 cents.