"This is a tough one to review as there are some outstanding strengths and a few notable weaknesses. The strengths: this is a recently fully updated, beautiful modern resort hotel in a spectacularly beautiful cove setting, well outside the hubbub of Hvar town itself. The structures are elegant, the views divine, the atmosphere serene (hence Sirena?). The on-site dining and pool are top-notch. The weaknesses: the restoration is still a work in progress - the spa isn't open yet, some kinks in the A/C and electric are still being resolved, the staff still needs further customer service training. The hotel capacity will be 154 rooms; happily during our stay it was about 1/3 occupied, which made access to everything easy. Not sure how that will work at full occupancy. It's also important to note that the beach area, integral to the hotel, is public, so local non-guests are free to hang out and swim there (which they do). And it's a rock, not sand, beach. Doesn't spoil the experience of floating in the Adriatic there, just good to know.
If they smooth out the system and service rough edges, this should be a beautiful place to stay. It is a spectacular complex of structures, and the site is magnificent. It deserves more than 3 stars for sure, and the pricing makes it a very good value."