Thanks. So this "housing issue" is really just about central Stockholm then is that correct? 15 to 30 is not much of burden in terms of commuting times.
15-30 mins in commuting distance is very optimistic unless you are able to pay through your nose. Think of it like this, if you earn an average salary then you can spend this much (pre-tax income) for living this close in commuting time from the city center.
75% of it for living < 5 mins away
50% of it for living < 10 mins away
30% of it for living < 15 mins away
25% of it for living < 30 mins away
20% of it for living < 60 mins away
15% for > 60 mins away
Adjust percentages upwards if you are desperate and downwards if you have enough funds to purchase an apartment.