Bus 53 or 55 from Slussen (Katarinasv).  Walk round or across the ring's diameter to 51 at the other side. 
Or take one of the 100s of busses to Henriksdal and walk up the steps at Henriksdalsviadukten at top go right. It's 1-2 min walk. Buses 53 and 55 from slussen Katarinavägen comes direct here. Otherwise any bus that stops at Henriksdal, walk to Henriksdalsviadukten under bridge and hard right at bus stop up the steps to the top.

 Laidbird is co-hare. 
The address is Henriksdalsringen 51. This is also the ON-IN. 
I need to know how many circa are cumming for food. There will be veggie, gluten/lactose-free. 

/Jetsex