If 'Sustainable" means "offering unfinished building's experience", then it will be good choice. You can experence rotten fish or shrimp smell, Hideous construction area, Unsafety building with cracks, Noise, Not-connected Internet, Dirty water.. I really doubt that this place shown as 5 stars. This place will fully mess up your trip to Karimunjawa. (But it is near Alun-Alun to enjoy grilled seafood)
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