Hi Janet
thank You so much for the recommendation and insight. I've checked Il Belvedere and they are wonderful indeed especially the parking right in front of the hotel and outside the ZTL zone. I will drive from Bari and it would not cross the ZTL path too on the way to the hotel. I'm still looking for one closer to the Sassi though (lazy walker :D) but most likely I'll book with Il Belvedere. I read their reviews about the service and the English speaking staffs. That would be really helpful with my staying. And of course the drunk cake that intrigues me as well uhmm ;)
As for the Parco della Murgia, we plan to hire a guide but don't want to hike from the bottom so perhaps we need to sort this out first with the tour guide office. Do you happen to see any guide wondering around in front of the cave churces? I read that some of them are locked and only the guide has the lock. The suspension bridge is also recently damaged and I think it might not repaired yet until my visit. So the only way at the moment is by driving. How long does it take you to drive there? I see gmaps showing 30minutes but read someone review it took only 5 minutes?
How is the construction going on by the time of your visit? I read they are preparing for 2019. Glad could visit it before that time (won't be the same with now) but quite worried with the construction going on.