Long Term Stay

VISA (for Indonesians)

For long term stay

(WARNING: This was valid in 2010-2011. It may have changed by the time you read this post.)
When you apply for visa to Sweden for reasons such as studies or employment (spouse visa doesn't apply here), make sure you state the date for entering and leaving as at least ONE YEAR EXACTLY, NOT EVEN A DAY LESS. For instance, just put the date in the form as 1 June 2014 until 1 June 2015, even though in reality your flight is from 4 June and you're not even sure yet when you leave Sweden. This matters because when you have the visa to be less than one year, you cannot apply for personnummer once you are in Sweden. Any further extension of visa after you enter Sweden can be done in Migrationsverket. 

PERSONNUMMER

Personnummer is like the Swedish social security number. It starts with the yymmdd of your birthdate, followed by four digit number. You get this number by going to the Swedish Tax Agency (Skatteverket) and this is where your visa date period matters. You need personnummer for so many things in Sweden and without it, you don't really exist in Sweden. Of course, you can get by without a personnummer, but life would be inconvenient.

ID kort

The Swedish identity card (ID kort) is optional, but again it makes life easier because you don't need to carry your passport around whenever it is necessary to show valid ID (legitimation). You apply for ID kort to Skatteverket after you have a personnummer. The thing is, there you must show proof of transfer to their bank account giro, no cash accepted. They will however accept international transfer. Just make sure you have the proof of transfer and wait for at least a day or more until the money is in. They will tell you to come back another day when they check that the money is not yet in. A residence card from Migrationsverket is usually not accepted as valid ID because it does not contain your personnummer. 

SFI

SFI stands for svenska för invandrare or Swedish for immigrants. When you have personnummer, you are entitled to have Swedish course for free at the kommun you are living in. If you want to study in a kommun other than your kommun, you need to first get the permission from your kommun. For someone with a university degree and proficiency in English, I would say it takes about 6 months full time to complete level C and D. With a university degree, you can also opt for Swedish course at Stockholm university, and it's called svenska som främmande språk. It's better structured and has better quality of teaching from what I heard (never attended it myself). It is a university course, which means that it is only offered during the two Swedish teaching terms: Höst termin August-December (HT) and Vår termin January-June (VT), and you need to apply in advance, whereas with Sfi you can apply no matter when. You can also change schools for your Sfi if you're not happy with the quality or environment. I did it in Folkuniversitet near Rådmansgatan tunnelbana (subway green line) and I was happy with the teaching. Knowing Swedish helps to understand public announcement as well as understanding the words' spelling and their correct pronounciation. 

Bank ID for internet banking

From your respective bank, you get a keycard and a card reader in order to do any internet transactions. Another useful thing to have is BankID which you can use to log in to websites of myndigheter (authorities) like Skatteverket to access official documents such as personbevis (population register) or declare your taxes. You do this by plugging the cord that you should obtain together with the keycard into your computer, then you install the software for BankID from your bank's website (instructions are mostly in Swedish, google a lot or just invest your time in Sfi). Another way is by installing Mobil BankID app on your smartphone. Most bank personnel in Sweden are helpful and easy to communicate with online and offline, so take advantage of their service if you're not sure how this works.

Housing is extremely difficult to find in Stockholm
I'm sorry to say this, but housing in Stockholm is nearing-hopelessly difficult to find. The best way is to get a Swedish connection, be it through work or study or friends/families, or be on the housing queque as long as one year in advance before you move to Sweden. Even then it may take a while before you can get something more than 6 months to rent. It is easier to get rent for 1-3 month period but who really wants to move once every 2 months? Just be patient, keep searching and always be aware of potential scams. Never pay anything until you see the apartment yourself. For more information, I can recommend this blog: moving2stockholm.