Well, Jongert is a very respected Dutch firm, well known in the luxury yachting world. Same for Devries Lentsch as designer. The boat will be extraordinarily well built. It is also old, heavy, and a motorsailer, by definition not a great sailing boat.
the pictures show it to have been well maintained, at least to the point when they were taken, but it would be interesting to see a what a proper survey would turn up. Is the steel deck plate corroding under the teak? What is the state of the mechanicals.(Notice there are no engine pictures)
Don't get too excited about the 9knots max speed listed. That won't happen anytime soon, unless they mean SOG
Having said that I love steel boats and this one looks particularly nicely put together and outfitted. If it has had a recent refit it may ba a great deal.
If you haven't already you may want to post the same question at Welcome to the Metal Boat Society
If you love steel boats they are a great resource specific to them. Of couse they are no substitute for Sailnet, and especially Giulietta when it comes to general sailing topics!