Sandra,
From your coordinates I take it you live close to, or in Stockholm - correct?
If so, what you will be able to see in your scope depends to some extent on how often you will be able to take it into truly dark areas. Close to the city you should be able to see the brighter DSO's, but farther away you can go deeper - read Rob_K's observation reports on this forum for details, even if they relate to the Southern skies.
Do not expect too much when it comes to galaxies or faint nebulae: only the very brightest will show from a place close to a big city. However, star clusters, some planetary nebulae, double stars, planets and the Moon should be well within its reach.
Also keep in mind that in summertime it may not really get 'astronomically dark' where you are, as during the height of summer the Sun does not sink below the horizon far enough.
good luck
