I've been to Sifnos a couple of times and adore the island. I'm visiting this summer and celebrating a 'big' birthday in the process and want to treat myself to somewhere nice to stay for the big day. I've stayed at Hotel Petali before which was lovely but am considering staying at Windmill Bella Vista this time. Anyone ever stayed there? Any comments, good or bad would be welcome. Or any other suggestions of any other nice hotels to suit the occasion?