From Stockholm Central Station to Elite Hotel Arcadia
From T-Centralen take any train (red line) towards Morby Centum. You get off after 3 stops at station Tekniska högskolan and take the exit Körsbärsvägen. Keep go straight when you come out. The bus stop is just on the right side of the street at the beginning of Körsbärsvägen . Elite Hotel Arcadia is located at Körsbärsvägen. Walk for about 3 minutes and you will find the hotel to your left.
From Elite Hotel Arcadia to Nordita
To Nordita it is a 15 min walk. When you leave the hotel turn left following Körsbärsvägen. After 450 meters cross a small part and keep go straight to Ruddamsbacken. Walk for about a minute and then turn left to Roslagstullsbacken. Nordita is at the top of that street, across the roundabout, behind Albanova main building.
Instead of walking, you can take the bus no. 61 from just outside the subway exit (50 m ahead, along the sidewalk) to the last station Ruddammen.