Dont know your charging limits, but i have been in Dolphin hotel last summer.
It's a nice place, but i think location is not the best one.no good views from the window, and the beach is not good... (I hope the owner of the hotel is not reading this) You can only swim in the pool, but even this one is not enouph large.
If you dont have a problem with the location, i sugest another hotel, in the other part of Chalkidiki. the place is called Ouranoupolis, and the hotel is called Aristotelis.
Mail me to send you some pics of the window's view.
you'll love it.