Stayed at the Danhostel Grindsted for one night in May 2022.
The accommodation itself is in a great location near to the bus station and a short walk from shops and supermarkets. This is particularly useful if you're visiting Billund/Legoland but be aware this is a cheap 20 minute bus journey or expensive taxi ride away.
The rooms are dorm style and private, there is a bathroom with a toilet, shower and sink, although mine didn't have any soap (you'll need to bring your own) and the shower was really not much use at all. It's really important to note that bed linen and towels are NOT included in the price and quite an expensive extra if you fully occupy the room. You can bring your own though if you wish.
The linen I had was a little soiled however the reception is not manned so you can't speak to anyone about it in person. If you open a second pack they will charge you for it, so bear this in mind.
A couple of other things to note is that there was a gap you can see through around the windows (ok when I visited but will let a draught through in winter I guess) and you must clean your room yourself before departing, empty the bin, etc or they might charge you for that too.
Overall I am disappointed with the accommodation and when I complained a week after departing was told that they "cannot accept complaints almost 10 days after you check in", so please bear this in mind if choosing to stay here.