Really, it depends entirely on what you think of the piano. I am not aware of this model, but Kawai uprights are
very passable (have one myself). Do you know the date exactly? 6 years is a long time. If you love this piano buy it (also try barganing a bit, lowers the price), but if you can wait, try to get a newer piano you truely love, they do appear, just keep looking.

I don't know much about euro, but in Canda, I purchased a Kawai Ns-20a 50 inch upright for $6500 Canadian before tax (roughly 4000 euro), and it was only 3 years old with one year of use!
Follow your heart.

(That was cheesey

, but true)