It looks good to me but the pics are a bit dark. One leaf looks a bit damaged but I don't know what it can be. If you take pics with better light we may be able to help you more.

Here is a beter picture. It is the tow lower leaves that look different to the others. There where some more leaves earlier that looked a bit like this but the seam to get darker green now.

I did try tow of the fruits that where on when I bought it and they had no seeds.

Is that becouse of some chemical pollination?

If you have re-potted it, I'd wait a couple of weeks before starting to fertilize.

Water from top, and I assume you knew to put it in a well draining mix?

You'r from Sweden right(in the bottom picture I think I see a "Filmjölk"-package)? If so, greetings from Finland and it's nice to see a fellow Scandinavian here! :)

If you do have a Plantagen-shop nearby, buy their Orchid-soil and mix in some coarse perlite. I've found that to be a good basic mix for many houseplants, including citruses.

Yes I'm from Sweden! I did save most of the soil from the original plant, I changed mostly to get another pot.

Next time I repot I will get some new soil after your instructions.

Most of the leaves are dirty so I will give it a shower tonight.

I think I should wait a bit for higher temperatures before I put it outside to not kill the flowers.

I have an extra lamp that I can use a few hours when it doesn't get sun on the balcony.

For my small seed grown plants I have used a mix of 70% regular plant soil and 30 % sand and some leca stones in the bottom. Is that good?

I see some more leaves coming now and tow fruits so I star to give it some fertiliser.

Thanks for all advice :)