Where in Oslo would be nice to get a Flat?

Ciao Everyone,

I am Carlos, because of work I am moving to Oslo within the year, I don't know anyone there at all. So I would like to ask some friendly advise on which area of the city would be a nice place to move (not the most expensive ones) just wanted to find an area with great connection links...not too centre near shops and stuff...i design at home most of the time but i do travel a lot so home to the airport that serves Ryanair is sort of important.

thanks for all of the replies!