Stockholm suffers from extreme housing shortage. I live here now but in a student flat I got after 3 years of queue time, and moving in a couple of month. Not worth it and I think this will limit the number of startups in the future.
Someone said something about old-school tech and it is true, I rarely meet anyone who is on the edge on new technology. I find myself always explaining what something is, but regardless of tech there are some talented people here.
There is also some serious tax problems, long over 50% in tax. People think they only pay around 23% in tax since the government splits up the tax in two parts, one for the company (around 32%) and one for the employee but money that would have been yours. Then you have tax on items and for example gas tax. Everything is very subtle and perhaps why they get away with it.