Magnus,
we need to see the whole sword, the boshi (that is the hamon in the kissahi or the point of the sword (kissaki). It would be good if you could take a picture of the back of the sword (mune) so that we can see part of the nakaho (tang) and part of the blade - this will show if the sword is healthy of polished down.
Also pictures of the hamon would be nice - you could try to take pics holding the sword against a light source (difficult). Examples here: http://www.ksky.ne.jp/~sumie99/hamonpatterns.html
Before you commit to a polish, keep in mind that there are risks involved. A bent blade must be fixed, which may result in hairline cracks (hagire) - a fatal flaw. A polish is expensive (very expensive).
I am not quite sure if there are qualified polishers in Europe - do not take any shortcuts or you might ruin the sword.
You might want to study a bit before doing anything with the sword. Do not rush, as a wrong decision will cost you a lot of money and might ruin the sword. Sometimes it is better to leave a sword as it is. Remember to apply a thin (very thin) coat of choji abura (clove-scented oil used for nihonto) or machine oil. Don't use gun oil or any vegetable oil. Here is a thread discussing proper oil:
http://www.ksky.ne.jp/~sumie99/hamonpatterns.html
Buy some books (recommendations abound - viewtopic.php?f=9&t=15682&hilit=beginner+books+nihonto+nakahara)
Also, please read this very practical information here: http://www.ksky.ne.jp/~sumie99/hamonpatterns.html
Again, don't rush. Straightening a sword is serious business and must not be done by some amateur. Polishing is even more serious, and there are too many self-styled polisher who are prepared to ruin your sword and charge you big bucks for it.
One of the many discussions about polishers here: viewtopic.php?f=9&t=6164&hilit=polishers+europe
Hope that helps.