The perfect mixture of a hotel and hostel!
This place is so well run, the check in/out is straight forward and easy plus you can use the keybox when you go out so you don't have to carry your key around, a convienient luggage room, it's easy to navigate around the building, the shared kitchen/living space is well managed and clean with signs informing you of the rules and important information and the rooms/bathrooms being private makes it feel more like a hotel.
Having alcohol banned on site and notices of quiet hours deters party groups making this place perfect for everyone, I saw families, couples, adult groups, younger groups and so on. Don't let the word hostel deter you!
The room was perfect, comfortable beds, the bathroom was a wet room which I much prefer, there's a small vent you can open/close above the window to allow air flow (it's normal that windows don't open in Stockholm), no issues whatsoever.
The location is fantastic, you can find anything you need within a minutes walk, across the road (diagonally) there's even a great cafe. The nearest metro station Fridhemsplan is only 3 minutes away (walking) or you can grab a bus down the road. Make sure you buy a physical SL card and buy a multi-day ticket, it's well priced and the physical card gets you SL ferry travel too!
The staff I saw during the stay were great, very friendly!
I really have no complaints and will be staying here for future Stockholm visits!