Xenia's windmill is the perfect place to get away from it all. With a 180 degree view to die for, we spent most of our visit outside on the terrace overlooking the other islands, watching the ferries and watching the sunset. Stunning.
The windmill is plenty big enough for 4 adults and has been done out very tastefully inside. It's 10 mins walk to the town of Tinos for shopping, lunch or dinner... And a €4 taxi home after a few drinks. In the other direction, there's a romantic little beach about 2 mins away and other beaches one after the other after that.
So, if you want to relax, recharge your batteries and get away from it all, I'd highly recommend both the windmill and Tinos.