The track is rather short, not too technical, but has some nice twists, like a long fast right going slightly uphill. 5th gear is likely what you can achieve in a GT3 RS. I haven't checked, but don't think, that it complies with FIA safety standards. Run-off areas are available, but mostly grass (if I remember correctly).  There is a nice restaurant at the track that you'll need for the 2h break during noon. The personal is very friendly and helpful. For me it would be ok for a day but likely not for two.

If you consider renting a track, you may want to have a look at  https://grobnik.hr, which is fast and quite technical. As an additional plus, it's close to the sea with some nice hotels for the wifes