Congratulations on the house! That's awesome.
I'm not sure if this is available in Holland, but I like to use either Krylon Acrylic in a rattle can or Mr. Hobby Topcoat, also in a rattle can. I use these for gloss, semi-gloss and flat. I heat the cans in hot water and shake them for a few minutes before using to prevent "orange peel" and runs. I also warm up the surface to be painted, either in the sun or with a hair dryer to ensure better adhesion. I always get a super smooth, even finish using these products and this technique.
Cheers,
Bud