Moving to Sweden - we need your advice! (Stockholm)

Hello ! My boyfriend and I are looking forward to moving to Stockholm. I mean, actually, we are still considering several european cities, among which is yours. :) Thus, we are looking forward to read your tips concerning these subjects:

- Is life very expensive in Stockholm?
- Could you share some websites where we can look for jobs (designer/communication/journalism/translation/tourism, etc.)?
- Where can we find a flat/bedroom for a short-term stay?
- He speaks English/Spanish and I speak English/French/Spanish and I have a first year diploma on Chinese. However, none of us can speak Swedish. Is it easy to find a job in these conditions? Do the embassies offer intensive courses on Swedish?

- To the portuguese out there: está algum português a ler isto que nos queira ajudar?! :P

Thank you very very much! Tack!