I enjoyed my stay at this room very much :-)
The room is great, tidily and large enough for one person to live there comfortably. The flat is very clean and nice.
Jarl is a very nice, helpful and caring person, giving you your privacy. The position of this room is perfect. It is a peaceful area, but it took you only 2 subway stations to be at the central station and within the city. KTH is also not far away (for all exchange students ;)).
There is only one tiny thing to say: the walls are quiet thin so the flat is quiet clairaudient. So if you want to sleep long in the morning check whether Jarls (very lovely!) kids are there. Because they are kids, it could get a little bit louder ;-) But he will tell you whether they are there or not before confirming your booking.
Personally, I can really recommend the room and the host :-) It was very nice and I will come back if I'm looking for an accommodation in Stockholm again.