Budget: STF Fridhemsplan a hostel in Stockholm about 15 minutes by Metro from Kista (the workshop venue).

Lower end: StayAt Appartments Kista 5 minutes walk from KTH Forum in Kista. Ibis Hotel Kista (Link to Swedish page) is a 25 minute walk from KTH Forum.

Average: Comfort Hotel Stockholm very close to the Stockholm central station with a 17 minute Metro connection to Kista.

High End: Mr. Chip Hotel in Kista 10 minutes walk from KTH Forum. Memory Hotel 7 minutes walk from KTH Forum.

There are many more hotels in Stockholm and a quick search will give you additional alternatives. One place to start is at Stockholm’s official homepage (unfortunately, you need to have Flash installed for this).