Take the Blue Line northbound to station Näckrosen.
Exit Näckrosen TBana - use the exit that goes onto Skogsbacken, the pub is 20 metres from this exit.
There will be a single half arrow for those that can't see the pub from the station entrance!
Probably a good idea to bring a headlamp/torch, your drinking mug and spikes if icy or snowy.