Me too… The trick is to avoid currency exchange because you’ll loose, I think 0,25% with Avanza, every time. My experience is that swedish banks typically charge 0,75% when you transfer foreign currencies in / out. But it’s not clear because these fees aren’t clearly visible and it’s impossible to know for sure which exchange rate was used.
When you buy any stock / fund listed as EUR from a SEK account they’ll charge that fee AND when you sell plus on any dividend paid. Unfortunately Avanza does not offer native accounts in EUR. I don’t know if any other institute does… Perhaps Degiro since they operate in Sweden and other european countries?
You mentioned that you have 400k SEK that you wish to invest? If you do 1000 SEK a month that’ll take 33 years. Much too long in my opinion. Consider maybe 12k / month and the lump sum will be invested in 3 years.
Avanza Global is quite diverse in itself (1500 companies from different countries, sectors and currencies). The main problem I see is that it only contains very large companies and only from developed countries. Its not bad to extend with an Emerging Markets fund for example but there is of course no guarantee that this will pay off even in the long-run.
Long bonds are complicated unfortunately and should not be considered low risk as their value will change drastically when interest rates change. For example, if the interest rates are lowered then the bond value will increase and vice versa. It’s better to consider short bonds or even a normal savings account if you need stability.
Hope this helps and good luck with your investments!
ps. for currency exchange if you need to transfer to/from banks in other countries. Consider using Revolut or TransferWise. At least they are more transparent on what their exchange fees are…