Okay, well… nigga I honestly have no idea about whether it would even be possible to grow weed in fucking ICELAND.
However, if you have a short period of time where it is indeed possible what you're going to want to do is grow autoflowering strains.
These Autoflowering strains will finish really quickly. Granted, they won't yield as much but with the lack of sun and climate that you live in which probably has a tiny summer period that's honestly the best that you can hope for.
http://www.gorilla-cannabis-seeds.co.uk/cold-wet-strains
https://sensiseeds.com/en/cool
I honestly think that it would be much easier for you to do a small indoor grow because then you could grow it all year round. It's not going to smell if it's not massive and there are certain strains that are known for not having a potent smell.
I suggest reading on what nutrients you'll want to give your plants, because of the frozen viking shithole that you live in you're going to want them to get as much sun exposure as possible but I would be careful about their exposure to winds.. I have a feeling iceland gets a lot of wind.